Category: H&amp;N Case Review

2021-01-11

1:17 pm

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salivary

Head & Neck Case Review

January, 2021

History

An 80-year-old female with a history of squamous cell carcinoma of the tongue that was treated by hemiglossectomy presented a year later with a tender right neck mass. A right radical neck dissection was performed, consisting predominantly of matted cervical lymph nodes with necrosis. In addition, Level IB contained a 3.0 cm well circumscribed, firm, tan-pink mass, shown below.

Images

Quiz

Q1. The histologic features are consistent with:

A. Sjogren syndrome
B. Atypical lymphoproliferative disorder
C. Chronic sclerosing sialadenitis
D. Chronic sialadenitis
E. Castleman disease

Q2. Which statement is TRUE about this disease?

A. It is considered an IgG4-related disease.
B. Fine needle aspiration of salivary gland can be diagnostic.
C. It can result from compression by an adjacent tumor.
D. Obliterative phlebitis is a characteristic feature.
E. Lymphoepithelial lesions are characteristic features.

Diagnosis

Chronic sialadenitis

Chronic sialadenitis typically presents as pain and swelling related to mealtimes. Histologic features include varying degrees of lymphoplasmacytic inflammation with lymphoid aggregate formation, interlobular fibrosis, acinar atrophy, and ductal dilation. The lymphocytic cells are composed of a mixture of B and T cells.

There are many causes of chronic sialadenitis, but the most common is persistent or recurrent duct obstruction by calculi. Stricture or extrinsic compression by tumor can also impede salivary flow and result in similar changes. Sialadenitis may occur in patients treated by radiation therapy for head and neck cancers, with serous acini of the parotid being more sensitive than the mucous-cell-rich submandibular gland.

Systemic disorders (such as autoimmune conditions or Sjogren disease) histologically present with chronic inflammation, fibrosis, loss of acinar tissue, and characteristic ‘lymphoepithelial lesions’ (proliferations of ductal remnants which are infiltrated by lymphocytes). Clinically, there will be keratoconjunctivitis and/or xerostomia and the swelling is commonly bilateral. Correlation with serological findings of Ro(SS-A) and/or La(SS-B) autoantibodies, rheumatoid factor, and antinuclear antibody would also corroborate the diagnosis.

Immunoglobulin G4-related disease (IgG4-RD) is an immune-mediated fibroinflammatory condition that can affect the salivary glands. Distinctively, IgG4-related sialadenitis exhibits storiform fibrosis, obliterative phlebitis, and dense lymphoplasmacytic infiltrates with larger germinal center formation. In addition, it is characterized by markedly increased numbers of IgG4-positive plasma cells, compared to chronic sialadenitis or Sjogren syndrome. Typically, the ratio of IgG4:IgG positive plasma cells is >40% and serologic studies show IgG4 levels of >135 mg/dl in diagnostic cases.

Extranodal marginal zone B cell lymphoma may also be a diagnostic consideration. A lymphoproliferative disorder is suspected by a loss of lobular architecture with extension of atypical monoclonal B-lymphocytes beyond the capsule and into the adjacent tissues. The neoplastic cells are small to medium in size with relatively abundant pale cytoplasm that imparts a monocytoid appearance. These cells are CD19+, CD20+, CD79a+, CD3-, CD5-, CD10-, CD23-, and cyclin D1- and demonstrate light chain restriction. Further ancillary testing, such as cytogenetics and molecular studies, may also be used to evaluate for associated chromosomal translocations and/or genetic mutations.

It should be noted that fine needle aspiration is not useful in the diagnosis of chronic sialadenitis due to non-specific findings of the aspirate, which also tends to be paucicellular. In the present case, the patient did not have autoimmune disorders, radiation therapy, or sialolithiasis. The most significant finding was that of marked encasement of the carotid artery and nearby muscular branches supplying the submandibular gland by the squamous cell carcinoma. Given the unilateral presentation of the mass lesion, we include ischemia as a cause of chronic sialadenitis.

In conclusion, the constellation of lymphoplasmacytic inflammation, fibrosis, and acinar loss with sialoliths supports the diagnosis of chronic sialadenitis. Several other causes of chronic sialadenitis have been suggested, including ischemia, as presented in this case.

References

Geyer JT, Ferry JA, Harris NL, et al. Chronic sclerosing sialadenitis (Küttner tumor) is an IgG4-associated disease. Am J Surg Pathol. 2010;34(2):202-210. doi:10.1097/PAS.0b013e3181c811ad
Xu WL, Ling YC, Wang ZK, Deng F. Diagnostic performance of serum IgG4 level for IgG4-related disease: a meta-analysis. Sci Rep. 2016;6:32035. Published 2016 Aug 25. doi:10.1038/srep32035
Geyer JT, Deshpande V. IgG4-associated sialadenitis. Curr Opin Rheumatol. 2011 Jan;23(1):95-101. doi: 10.1097/BOR.0b013e3283413011. PMID: 21124091.
Umehara H, Okazaki K, Masaki Y, Kawano M, Yamamoto M, Saeki T, Matsui S, Yoshino T, Nakamura S, Kawa S, Hamano H, Kamisawa T, Shimosegawa T, Shimatsu A, Nakamura S, Ito T, Notohara K, Sumida T, Tanaka Y, Mimori T, Chiba T, Mishima M, Hibi T, Tsubouchi H, Inui K, Ohara H. Comprehensive diagnostic criteria for IgG4-related disease (IgG4-RD), 2011. Mod Rheumatol. 2012 Feb;22(1):21-30. doi: 10.1007/s10165-011-0571-z. Epub 2012 Jan 5. PMID: 22218969.
Neville B, Damm D Allen C and Chi A. Oral and Maxillofacial Pathology ed.4. Elsevier, 2016.
Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele J (Eds): WHO Calssification of Tumours of Haematopoietic and Lymphoid Tissues (Revised 4^th edition).IARC: Lyon 2017.

Quiz Answers

Q1 = D. Chronic sialadenitis

Q2 = C. It can result from compression by an adjacent tumor.

Contributors

F. Zahra Aly, M.D., Ph.D., Clinical Associate Professor, Department of Pathology, Immunology and Laboratory Medicine, University of Florida College of Medicine
Saja Alramadhan, BDS, PGY-3 Resident, Department of Oral and Maxillofacial Pathology, University of Florida College of Dentistry
Nada Al Qaysi, MD, PGY-4 Resident, Department of Pathology, Immunology and Laboratory Medicine, University of Florida College of Medicine

Head & Neck Case Review 2020-12

2020-12-16

8:40 am

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salivary

Head & Neck Case Review

December, 2020

History

A boy presented to the pediatric otolaryngology clinic with a chief concern of mass in his left neck of several months’ duration. He was also experiencing mild intermittent pain. There was no lymphadenopathy. Pre-operative imaging studies identified an intraparotid nodule. A superficial parotidectomy was performed. H&E sections of the nodule are shown.

Images

Quiz

Q1. Which gene is most likely to harbor an alteration in this patient’s tumor?

A. MAML2
B. NR4A3
C. PLAG1
D. PTEN

Q2. This tumor type is associated with a considerable rate of recurrence.

A. True
B. False

Diagnosis

Sclerosing polycystic adenoma / Sclerosing polycystic adenosis

Sclerosing polycystic adenoma/sclerosing polycystic adenosis is a rare benign lesion of salivary glands. It occurs over a wide age range from children to elderly with a male to female ratio of approximately 2:3. The most commonly involved salivary gland is parotid, followed by the submandibular gland. Most patients present with a singular, painless, slowly enlarging neck mass as an isolated condition without apparent association with other lesions.

These lesions are often well-circumscribed with an absent or incomplete pseudocapsule and are surrounded by normal salivary gland tissue. The cut surface is typically solid with scattered tiny cystic spaces. Histologically, sclerosing polycystic adenoma/adenosis consists of a proliferation of cystic ductal structures and acinar cells surrounded by abundant hyalinized stromal collagen, exhibiting a characteristic lobular architecture. The acinar cells often contain abundant brightly eosinophilic cytoplasmic zymogen-like granules, a key histologic feature of this tumor type. Intraductal epithelial dysplastic proliferations may be seen, ranging from mild to severe dysplasia.

These lesions were initially considered to be a reactive or inflammatory process, and the term “sclerosing polycystic adenosis” was used. However, emerging evidence suggests a clonal process characterized by recurrent gene mutations in the PI3K pathway, with PTEN mutations identified in all analyzed cases. Therefore, the term “sclerosing polycystic adenoma” has been proposed to reflect the likely true neoplastic nature of this process.

Management of sclerosing polycystic adenoma is conservative surgical excision. Tumor recurrence is uncommon but remains significant.

References

Smith BC, Ellis GL, Slater LJ, Foss RD. Sclerosing polycystic adenosis of major salivary glands. A clinicopathologic analysis of nine cases. Am J Surg Pathol. 1996;20(2):161-170.
Gnepp DR, Wang LJ, Brandwein-Gensler M, Slootweg P, Gill M, Hille J. Sclerosing polycystic adenosis of the salivary gland: a report of 16 cases. Am J Surg Pathol. 2006;30(2):154-164.
Skalova A, Gnepp DR, Simpson RH, et al. Clonal nature of sclerosing polycystic adenosis of salivary glands demonstrated by using the polymorphism of the human androgen receptor (HUMARA) locus as a marker. Am J Surg Pathol. 2006;30(8):939-944.
Bishop JA, Gagan J, Baumhoer D, et al. Sclerosing Polycystic “Adenosis” of Salivary Glands: A Neoplasm Characterized by PI3K Pathway Alterations More Correctly Named Sclerosing Polycystic Adenoma. Head Neck Pathol. 2020;14(3):630-636.

Quiz Answers

Q1 = D. PTEN

Q2 = A. True

Contributor

Jiancong Liang, MD PhD
Assistant Professor
Department of Pathology, Microbiology and Immunology
Vanderbilt University Medical Center, Nashville, TN

Head & Neck Case Review 2020-11

2020-11-02

11:41 am

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thyroid

Head & Neck Case Review

November, 2020

History

A 58-year-old woman presented to her physician with a chief concern of mass of her anterior neck, of several years’ duration. She was also experiencing dysphagia and hoarseness. Review of her medical history revealed no medical conditions or medications. The patient had smoked cigarettes for many years. The mass was firm to palpation. It was centered in the thyroid gland and was fixed to underlying anatomic structures, per radiographic evaluation. At the time of presentation, the patient was euthyroid. A total thyroidectomy was performed, with suspicion for a malignant process.

Images

Quiz

Q1.

Given the histologic findings, which additional laboratory test would be most beneficial in evaluation of this patient?

A. PTH
B. RET status
C. Serum IgG₄
D. Serum thyroglobulin

Q2. What is the vascular alteration characteristic of this disease process?

A. Vasculitis
B. Superior vena cava syndrome
C. Thrombosis
D. Occlusive phlebitis

Diagnosis

Invasive fibrous thyroiditis (IgG₄-related thyroiditis; Riedel thyroiditis)

Invasive fibrous thyroiditis is a rare form of chronic thyroiditis on the spectrum of IgG₄-related diseases, characterized by extensive fibrosis and increased IgG₄-expressing plasma cells. The cause is unknown. Any number of organ systems may be involved by this process, most notably the pancreas. When the thyroid gland is affected, extensive replacement of the glandular tissue by fibrosis is seen histologically. Up to one third of patients with invasive fibrous thyroiditis will experience IgG₄-related disease in another organ.

The condition is seen more often in women, usually in the 5^th decade. There is an association with cigarette-smoking. Patients usually present with a very firm goiter, often with compressive symptoms. Extensive fibrosis may damage the recurrent laryngeal nerve, causing vocal cord paralysis and hoarseness. The sympathetic trunk may also be affected, resulting in Horner syndrome. Occlusion of blood vessels and destruction of parathyroid glands may occur. Invasive fibrous thyroiditis may mimic malignancy clinically due to infiltration of the fibrosis into the soft tissues of the neck.

Microscopic examination reveals fibrosis overtaking the thyroid gland in broad hypocellular zones, with associated patchy chronic inflammation. Some residual atrophic thyroid follicles may remain, but extensive fibrous replacement is typical. Extension into the soft tissue and strap muscles results in fixation of the mass. Occlusive phlebitis (characteristic of IgG₄-related disease), or fibrosis and inflammation of small and medium veins, is noted in most cases.

Elevated serum IgG₄ levels are present only in about 50% of patients, and this finding is not specific to invasive fibrous thyroiditis, so it is of somewhat limited diagnostic value. Immunohistochemistry for IgG and IgG₄ is helpful if it demonstrates an increased ratio of IgG₄ to IgG-expressing plasma cells: a ratio of greater than 40% is supportive of this diagnosis. Hypothyroidism and/or hypoparathyroidism are typical sequelae of invasive fibrous thyroiditis.

While it may act aggressively, invasive fibrous thyroiditis is a benign condition and does not always require surgical treatment. Medical management of hypothyroidism and/or hypoparathyroidism is needed in affected patients. Patients should be monitored for manifestations of IgG₄-related disease in other organ systems, as systemic involvement is associated with significant morbidity and mortality. Corticosteroid therapy is useful in such situations.

References

Falhammar H, Juhlin CC, Barner C, Catrina SB, Karefylakis C, Calissendorff J. Riedel’s thyroiditis: clinical presentation, treatment and outcomes. Endocrine. 2018;60(1):185-192. doi:10.1007/s12020-018-1526-3
Mammen SV, Gordon MB. SUCCESSFUL USE OF RITUXIMAB IN A CASE OF RIEDEL THYROIDITIS RESISTANT TO TREATMENT WITH PREDNISONE AND TAMOXIFEN. AACE Clin Case Rep. 2019;5(3):e218-e221. Published 2019 Apr 25. doi:10.4158/ACCR-2018-0352
Darouichi M, Constanthin PE. Riedel’s thyroiditis. Radiol Case Rep. 2016;11(3):175-177. Published 2016 Jun 17. doi:10.1016/j.radcr.2016.05.017
Thompson LDR, Bishop JA. (2019). Head and Neck Pathology, 3^rd edition, pp 557-561. Philadelphia, PA: Elsevier.

Quiz Answers

Q1 = C. Serum IgG₄

Q2 = D. Occlusive phlebitis

Contributors

Anne C. McLean-Holden, DMD, MS: Emory University Hospital, Atlanta, GA

Justin A. Bishop, MD: University of Texas Southwestern Medical Center, Dallas, TX

Head & Neck Case Review 2020-10

2020-10-10

1:27 pm

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germ cell, thyroid

Head & Neck Case Review

October, 2020

History

A middle-aged man presented with a palpable neck mass and was found to have a complex 8.5 cm mass arising from the left thyroid lobe. He had no notable past medical history and no history of radiation exposure. The patient underwent hemithyroidectomy, with negative margins. Following resection, staging PET/CT/ultrasound did not demonstrate any other lesions.

Two months after hemithyroidectomy, the patient developed neck and supraclavicular swelling. PET/CT demonstrated a mass in the surgical bed extending into the mediastinum, as well as nodules in the contralateral platysma, sternocleidomastoid muscle, and supraclavicular region. A fine needle aspiration was performed of a palpable supraclavicular nodule. Images from the supraclavicular fine needle aspiration and thyroid resection are shown.

Images

Quiz

Q1. Which genetic alteration has been associated with this tumor?

A. BRAF V600E mutation
B. DICER1 mutation
C. RET-PTC3 fusion
D. Isochromosome 12p
E. PIK3CA mutation

Q2. Tumors occurring in infants and children generally have a favorable prognosis.

A. True
B. False

Diagnosis

Malignant Thyroid Teratoma.

Primary thyroid teratomas are rare neoplasms that, like gonadal teratomas, are defined by the presence of tissues derived from the 3 embryonic germ layers (ectoderm, mesoderm, and endoderm). However, in contrast to gonadal teratomas which may occur as a component in a mixed germ cell tumor, there have not been any reported cases of thyroid teratoma co-occurring with other subtypes of germ cell tumor. Furthermore, primary thyroid teratomas lack isochromosome 12p, so appear to be genetically distinct from teratomas of other sites.

A grading scheme proposed by Thompson et al. divides thyroid teratomas into three categories: benign, immature, and malignant. Benign teratomas contain exclusively mature elements. Immature elements are defined as tissues resembling embryonic components, most commonly immature neural elements. Immature teratomas contain immature elements occupying <4 low power fields, while malignant teratomas contain ≥4 low-power fields of immature tissues. Rooper et al. noted that not all malignant teratomas contained immature neural elements, but instead may show a predominance of primitive epithelial and/or spindled elements. The immature spindled areas often may have rhabdomyosarcomatous differentiation which express desmin and myogenin, a feature that is seen in the current case. Immunohistochemistry is often not required for diagnosis given the characteristic histologic features but may be useful in small biopsies or fine needle aspiration specimens. The tumors generally have TTF-1 and PAX-8 expression, with pancytokeratin positivity in the epithelial components and synaptophysin positivity in the immature neural elements.

Thyroid teratomas affect a wide age range and have a variable clinical course depending on histologic grade. Benign and immature teratomas of the thyroid are found in infants and young children and may occur congenitally. If surgical excision is possible, benign and immature teratomas generally have an excellent prognosis, with no reported cases of local recurrence or metastatic disease after complete excision. Despite favorable histology, congenital teratomas have been documented to be fatal due to tracheal compression and/or lack of normal neck development. Malignant teratomas are more common in adults and often behave aggressively, with a potential for local recurrence and distant metastases. Malignant teratomas have been shown to have recurrent DICER1 mutations, while these mutations were absent in tumors with benign/immature histology. The dissimilar molecular profile, along with the differences in clinical outcome and age at presentation, suggests that malignant teratoma may represent a distinct pathologic entity, as opposed to existing on a spectrum with benign/immature teratoma.

References

Rooper LM, Bynum JP, Miller KP, et al. Recurrent DICER1 Hotspot Mutations in Malignant Thyroid Gland Teratomas: Molecular Characterization and Proposal for a Separate Classification. Am J Surg Pathol. 2020;44(6):826‐833. doi:10.1097/PAS.0000000000001430
Agaimy A, Witkowski L, Stoehr R, et al. Malignant teratoid tumor of the thyroid gland: an aggressive primitive multiphenotypic malignancy showing organotypical elements and frequent DICER1 alterations-is the term “thyroblastoma” more appropriate? [published online ahead of print, 2020 Jun 7]. Virchows Arch. 2020;10.1007/s00428-020-02853-1. doi:10.1007/s00428-020-02853-1
Thompson LD, Rosai J, Heffess CS. Primary thyroid teratomas: a clinicopathologic study of 30 cases. Cancer. 2000;88(5):1149‐1158.
Miller DL, Thompson LDR, Bishop JA, Rooper LM, Ali SZ. Malignant teratomas of the thyroid gland: clinico-radiologic and cytomorphologic features of a rare entity [published online ahead of print, 2020 Apr 28]. J Am Soc Cytopathol. 2020;S2213-2945(20)30070-3. doi:10.1016/j.jasc.2020.04.008

Quiz Answers

Q1 = A. DICER1

Q2 = A. True. Teratomas in infants and young children generally have a very favorable prognosis. Complete surgical excision is typically curative.

Contributor

Margaret Compton, MD
Assistant Professor
Department of Pathology, Microbiology and Immunology
Vanderbilt University Medical Center, Nashville, TN

Head & Neck Case Review 2020-08

2020-08-19

2:09 pm

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https://pathpresenter.net/#/public/display?token=dd296748

bone, vascular

Head & Neck Case Review

August, 2020

History

A 30 year old patient presented with a pathologic mandible fracture and loose teeth following minimal trauma. CT imaging revealed a thin mandibular body and ramus with superimposed areas of permeative destruction and erosion, and a minimally displaced fracture of the mandibular angle. The ipsilateral maxillary sinus appeared hypoplastic. A segmental mandibulectomy with reconstruction was performed. The disease progressed within one year requiring total mandibulectomy and prosthetic replacement.

Images

Virtual Slide

Quiz

Q1. What is the diagnosis

A. Paget disease
B. Gorham-Stout disease
C. Angiosarcoma
D. Fibrous dysplasia

Q2. What are the characteristic histologic features?

A. Malignant lymphatic or vascular proliferation involving bone
B. Benign lymphatic or vascular proliferation and osteolysis
C. Cystic spaces lined by fibrous tissue with osteoclast-like giant cells
D. Osteonecrosis with a reactive lymphatic or vascular proliferation

Diagnosis

Gorham-Stout Disease.

Gorham-Stout Disease, also known vanishing bone disease or massive osteolysis, is a rare disorder that usually affects young adults but has a wide age range. It is considered to be an aggressive variant of hemangioma/lymphangioma, and is characterized by a proliferation of lymphatic spaces in bone resulting in osteolysis. The disease is named after Lemuel Whittington Gorham and Arthur Purdy Stout, who, in 1955, described the histologic features and established that the osteolysis was always associated with vascular proliferation. The proposed pathogenesis is a defect in lymphatic formation, either acquired or developmental, but the exact mechanism for osteolysis is not known. The etiology of Gorham-Stout disease remains unknown, and in fact whether it is a true neoplasm versus a reactive process is still debated.

Gorham-Stout disease can affect any bone, but usually affects the appendicular skeleton with predilection for the humerus, scapula, pelvis and skull. Involvement of the jaws is relatively uncommon, but the mandible is more commonly affected than the maxilla: A review of 185 cases reported in the literature from 1955 to 2013 reported that 27 cases showed involvement of the mandible, 7 showed involvement of the maxilla, and 4 showed involvement of both mandible and maxilla.

Radiographically, the earliest finding can be small intramedullary or subcortical radiolucent foci. As the disease progresses partial or complete dissolution of a bone or several adjacent bones is evidenced. This often occurs in a concentric pattern causing a “licked candy stick” or “mouse tail” appearance. Usually there is no solid or expansile mass lesion, and the disease can cross joints.

Histologically, the affected bones show a benign vascular proliferation composed of dilated, thin-walled blood vessels and/or lymphatics, sometimes resembling a hemangioma. Lymphatic vessels are not present in normal bones, but are present in medullary and cortical regions of bones in patients with Gorham-Stout Disease and may be a subtle finding early in the disease, especially because the surrounding bone shows minimal to no osteoblastic response. As the disease progresses, bone is subsequently replaced by variable amount of fibrous tissue with increased vascularity. Osteoclastic activity may be seen at the leading edge. The vascular walls may be difficult to appreciate in fragmented specimens, and in those scenarios, immunohistochemistry can be performed to highlight the characteristic lymphatic vessel proliferation with lymphatic markers such as D2-40 (see image), CD34, CD31, ERG, and FLI-1 and Factor VIII. As the histologic features are not specific, the diagnosis requires careful correlation with radiographic findings and the clinical features.

The disease may spontaneously arrest and stabilize, but often progresses rapidly and causes disability. There is no known optimal therapy, but surgical resection and localized radiation have been used when feasible. The role of systemic therapy has not been systematically studied.

References

Gorham LW, Stout AP. Massive osteolysis (acute spontaneous absorption of bone, phantom bone, disappearing bone); its relation to hemangiomatosis. J Bone Joint Surg Am 1955;37-A:985-1004.
Stocker, JT, Dehner, LP, and Husain, AN (2012). Stocker and Dehner’s pediatric pathology: Fourth edition. Wolters Kluwer Health Adis (ESP).
Fletcher CD (2013). Diagnostic histopathology of tumors: Fifth edition. Elsevier Health Sciences.
Nielsen, GP, Rosenberg, AE, Deshpande, V, Hornicek, FJ, Kattapuram, SV, Rosenthal, DI (2017). Diagnostic Pathology: Bone, second edition. Elsevier Health Sciences.
Edwards JR, Williams K, Kindblom LG, Meis-Kindblom JM, Hogendoorn PC, Hughes D, Forsyth RG, Jackson D, and Athanasou NA. Lymphatics and bone. Hum Pathol. 2008 Jan;39(1):49-55.
Dellinger MT, Garg N, and Olsen BR. Viewpoints on vessels and vanishing bones in Gorham–Stout disease. Bone. 2014 Jun; 63:47-52.

Quiz Answers

Q1 = B. Gorham-Stout disease

Q2 = B. Benign lymphatic or vascular proliferation and osteolysis

Contributor

Manuel Lora Gonzalez, MD
Selective Surgical Pathology (Head and Neck) Fellow, PGY-6
Department of Pathology and Immunology
Washington University in St. Louis

Head & Neck Case Review 2020-07

2020-07-02

3:21 pm

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odontogenic

Head & Neck Case Review

July, 2020

History

A 19-year-old male presented for initial dental examination upon entering the armed forces. His medical history was non-contributory, and he was asymptomatic. Panoramic radiographic examination (below) revealed a radiolucency of the anterior mandible. The lesion was vaguely multilocular with a corticated and smooth border and crossed the midline. Mild clinical expansion was noted. An incisional biopsy was performed, and the findings are represented in the photomicrographs below.

Images

Quiz

Q1. This lesion is most often found in which area of the jaws?

A. Anterior mandible
B. Posterior mandible
C. Anterior maxilla
D. Posterior maxilla

Q2. The radiographic features in this case are suggestive of malignancy.

A. True
B. False

Q3. This tumor does not have a known association with Carney complex.

A. True
B. False

Diagnosis

Odontogenic Myxoma.

Odontogenic myxoma is a benign neoplasm derived from odontogenic ectomesenchyme. It is the third-most common odontogenic tumor, after odontoma and ameloblastoma. Patients are typically in their second or third decades of life at the time of diagnosis, but this tumor has been reported in patients of nearly all ages. Odontogenic myxomas are found exclusively in the gnathic bones. Two thirds of tumors are found in the mandible, with a predilection for the posterior regions. Myxomas of the maxilla tend to be destructive, obliterating the maxillary sinuses early in the disease process.

Clinically, patients may be asymptomatic or demonstrate painless swelling of the jaw. Odontogenic myxomas may cause marked expansion, and cortical perforation may occur. Radiographically, myxomas present as well-defined unilocular or multilocular radiolucencies. Some cases exhibit the classic radiologic feature: a soap-bubble appearance. Displacement and/or resorption of adjacent teeth occurs often. Cortication of the borders is seen on panoramic imaging, but myxomas are better visualized by computed tomography (CT) or magnetic resonance (MR) imaging, because they diffusely infiltrate the surrounding bone.

Intraoperatively, a glistening grey to white mass is encountered. Tumor consistency is variable, depending on the ratio of collagen to myxoid ground substance present.

Histologically, odontogenic myxomas look similar to the dental papilla of a developing tooth. A hypocellular proliferation of delicate spindled cells in a myxoid background is characteristic. The cells are stellate with long cytoplasmic processes, and are regularly dispersed. Occasional odontogenic epithelial rests are identified in about 5% of cases, but this feature is not required for diagnosis. The matrix that supports the lesional cells is a myxoid ground substance, accompanied by a variable amount of collagen. If the collagenous component is prominent, the term “myxofibroma” may be applied, although there is no demonstrated difference in biologic behavior.

Immunohistochemically, the lesional cells of odontogenic myxoma are diffusely reactive with vimentin and focally reactive with smooth muscle actin. The ground substance is reactive with Alcian blue, and further investigation has demonstrated that it is composed mostly of the mucopolysaccharide, hyaluronic acid.

The differential diagnoses that should be considered include low-grade fibromyxoid sarcoma, myxoid nerve sheath tumors, chondromyxoid fibroma, and other myxoid sarcomas. It is also important to note that dental pulp may look very much like a myxoma; so, clinical and radiographic correlation is essential. Odontogenic myxomas are not related to Carney complex, nor to other syndromes which include soft tissue myxomas. There is, however, an association between odontogenic myxomas and tuberous sclerosis, as well as Gorlin syndrome.

Due to the infiltrative margins of odontogenic myxomas, curettage is ineffective. These tumors necessitate resection with uninvolved margins. The recurrence rate for odontogenic myxomas is roughly 25%, and the risk of malignant transformation is nearly 0.

References

El-Naggar AK, Chan JKC, Grandis JR, et al. WHO Classification of Head and Neck Tumors (4^th edition). IARC: Lyon 2017.
Martinez-Mata G, Mosqueda-Taylor A, Carlos-Bregni R, et al. (2008) Odontogenic myxoma: clinic-pathological, immunohistochemical and ultrastructural findings of a multicentric series. Oral Oncol. 44:601-7.
Kim J, Ellis GL. (1993) Dental follicular tissue: misinterpretation as odontogenic tumors. J Oral Maxillofac Surg 51:762-7.
Boffano P, Gallescio C, Barreca A, et al. (2011) Surgical treatment of odontogenic myxoma. J Craniofac Surg 22:982-7.
Banasser AM, Bawazir MM, Islam MN, et al. (2020) Odontogenic myxoma: a 23-year retrospective series of 38 cases. Head and Neck Pathol https://doi.org/10.1007/s12105-020-01191-7.

Quiz Answers

Q1 = B. Posterior mandible

Q2 = B. False

Q3 = A. True

Contributors

Anne C. McLean-Holden, DMD¹; Brenda L. Nelson, DDS, MS²

¹University of Texas Southwestern Medical Center, Dallas, Texas, USA

²Naval Medical Center San Diego, San Diego, California, USA

Head & Neck Case Review 2020-04

2 Comments on Head & Neck Case Review 2020-04

2020-04-18

1:05 pm

thyroid

Head & Neck Case Review

April, 2020

History

A 19-year-old female presented with a rapidly enlarging 7.5 cm left-sided thyroid mass. Multiple, bilateral pulmonary nodules measuring up to 2 cm were present on CT scan, consistent with metastatic disease. She underwent total thyroidectomy and left neck dissection followed by radioactive iodine ablation. Images from the thyroid resection are shown below.

Images

Quiz

Q1. Which gene is most likely to harbor a mutation in this patient’s tumor?

A. BRAF
B. DICER1
C. RAS
D. TERT

Q2. The prognosis for this tumor type is better in young people than in older adults.

A. True
B. False

Diagnosis

Poorly Differentiated Thyroid Carcinoma.

Poorly differentiated thyroid carcinoma (PDTC) is a clinically aggressive follicular cell derived neoplasm that represents approximately 1% of all thyroid malignancies. The 10-year patient survival (60-70%) is intermediate between differentiated and anaplastic thyroid carcinomas.

The most widely accepted definition of PDTC is the laid out in the Turin criteria, which were adopted by the World Health Organization Classification of Tumours of the Endocrine Organs in 2017. According to the Turin criteria, PDTC is defined as a tumor with solid, trabecular, or insular growth that lacks papillary nuclear features and has at least one of the following: ≥ 3 mitoses per 10 high power fields, tumor necrosis, or convoluted nuclei. There is some evidence that the Turin criteria can be applied to Hurthle cell (oncocytic) tumors as well.

The overwhelming majority of PDTCs occur in older adults (mean patient age of 60 years); they are exceedingly rare in childhood or adolescence. However, PDTCs that do occur in younger persons have unique features. They primarily affect teenagers and frequently harbor DICER1 mutations, which may be associated with hereditary DICER1 syndrome in a subset of cases. DICER1 mutations are very rare in adult PDTC, which often harbor driver mutations common in differentiated thyroid carcinomas (BRAF, NRAS, etc…). These mutations have not been found in pediatric PDTC.

While the prognosis of differentiated thyroid carcinoma is more favorable in younger persons compared to older adults, the same is not true for PDTC. PDTC in the young (< 21 years) is still an aggressive tumor type. Although data is limited, survival rates are likely similar to those in older adults. Prognostic features remain to be characterized but disease extent may be important. Large tumor size and extrathyroidal extension with positive resection margins may be associated with worse outcomes compared to more limited tumors or tumors with encapsulation.

References

Asioli S, Erickson LA, Righi A, et al. Poorly differentiated carcinoma of the thyroid: validation of the Turin proposal and analysis of IMP3 expression. Mod. Pathol. 2010;23:1269–1278.
Ibrahimpasic T, Ghossein R, Carlson DL, et al. Outcomes in patients with poorly differentiated thyroid carcinoma. J. Clin. Endocrinol. Metab. 2014;99:1245–1252.
Volante M, Collini P, Nikiforov YE, et al. Poorly differentiated thyroid carcinoma: the Turin proposal for the use of uniform diagnostic criteria and an algorithmic diagnostic approach. Am. J. Surg. Pathol. 2007;31:1256–1264.
Tallini G, Asioli S, Aubert S, et al. Poorly differentiated thyroid carcinoma. In: WHO Classification of Tumours of Endocrine Organs. 4th ed. Lyon: International Agency for Research on Cancer; 2017.
Chernock RD, Rivera B, Borrelli N, Hill DA, Fahiminiya S, Shah T, Chong AS, Aqil B, Mehrad M, Giordano TJ, Sheridan R, Rutter MM, Dehner LP, Foulkes WD, Nikiforov YE. Poorly differentiated thyroid carcinoma of childhood and adolescence: a distinct entity characterized by DICER1 mutations. Mod. Pathol. Epub ahead of print.
Hill DA, Ivanovich J, Priest JR, et al. DICER1 mutations in familial pleuropulmonary blastoma. Science 2009;325:965.

Quiz Answers

Q1 = B. DICER1

Q2 = B. False

Contributor

Rebecca Chernock, M.D.
Associate Professor
Department of Pathology and Immunology
Washington University in St. Louis

Head & Neck Case Review 2020-03

2020-03-31

1:44 pm

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parathyroid

Head & Neck Case Review

March, 2020

History

The patient is a 57 year-old male with a history of recurrent nephrolithiasis for 20 years. Serum biochemistry revealed: PTH 11.5 pmol/L (reference range, 2.0 – 9.3 pmol/L) and calcium 2.62 (reference range 2.20 – 2.60 mmol/L). A diagnosis of primary hyperparathyroidism was made. Pre-operative localizing studies were not helpful in determining location of a parathyroid lesion. Bilateral neck exploration was undertaken with planned parathyroidectomy.

Intraoperative findings included: three normal-appearing parathyroid glands (which were biopsied) and a single markedly enlarged left superior parathyroid gland (which was easily resected without adhesions). Intraoperative post-resection serum biochemistry revealed: PTH 3.4 pmol/L.

Surgical pathology received biopsies of the three grossly “normal-appearing” parathyroid glands which showed normocellular parathyroid tissue on histology (not pictured). The excised parathyroid weighed 4.27 g (fresh) and measured 3.1 cm in greatest dimension (pictured).

Images

Virtual H&E slide

Quiz

Q1. Compared to a conventional parathyroid adenoma, the entity in this case

A. is associated with an increased risk of vascular invasion.
B. occurs secondary to renal failure/changes in renal function.
C. frequently shows an increased mitotic index.
D. is comparable in terms of prognosis.
E. does not result in hyperparathyroidism.

Q2. The amount of adipose tissue is directly proportional to the body mass index of this patient.

A. True
B. False

Diagnosis

Parathyroid Lipoadenoma.

Parathyroid lipoadenomas are a rare manifestation of primary hyperparathyroidism. Only a few sporadic cases have been described in the literature. To diagnose this entity, several factors must be considered, both clinical and histological. From the clinical perspective, evidence of primary hyperparathyroidism must exist, typically confirmed preoperatively via serum biochemistry (as in this case), as well as intraoperatively by single gland enlargement. In this case, the other three parathyroid glands were sampled and were appropriately normocellular. Moreover, a post-operative biochemical cure is supportive of the diagnosis.

Histologically, parathyroid lipoadenoma exhibits extensive stromal adipose tissue and small, labyrinth-like nests of parathyroid cells, most often chief cells, arranged in cords or acini. Features of malignancy (invasion) and other atypical features (e.g. necrosis, increased mitotic count, fibrous bands) should be absent. Of note, there is no set definition or proportion of adipose tissue required for a diagnosis of lipoadenoma. However, many use >50% as a rough guide. Importantly, parathyroid glands are normally adipose-rich (~ 50% parenchyma / 50% fat). Assessing only the ratio of parenchymal cells to adipocytes is not necessarily reliable in the diagnostic evaluation of parathyroid disease. Size and weight are also important in defining an abnormal gland, and intraoperative and postoperative biochemical workup distinguishes uniglandular disease (adenoma) from multiglandular disease (hyperplasia).

Recognizing lipoadenoma is important for two reasons: (1) not to mistake it for invasion of parathyroid tissue into adipose tissue (carcinoma); and (2) not to underestimate this abnormal gland as normal, especially on frozen section or if dealing with limited tissue. Pathologic, clinical, and serologic correlation is necessary!

Prognostically, these tumors behave as typical adenomas. There is no documented difference in pre-operative biochemistry. Importantly, confirmed by a recent series, there is no correlation between a patient’s body mass index (BMI) and the formation of a lipoadenoma.

References

International Agency for Research on Cancer. Lloyd RV et al., eds: WHO classification of tumours of endocrine organs. 4th edition. 2017. International Agency for Research on Cancer: Lyon, France.
Juhlin CC, et al. “Lipoadenoma of the Parathyroid Gland: Characterization of an Institutional Series Spanning 28 Years.” Endocr Pathol. 2020 Mar 19. doi: 10.1007/s12022-020-09616-3. [Epub ahead of print]
Hyrcza MD, Sargın P, Mete O. “Parathyroid Lipoadenoma: a Clinicopathological Diagnosis and Possible Trap for the Unaware Pathologist.” Endocr Pathol. 2016 Mar;27(1):34-41. doi: 10.1007/s12022-015-9404-5.

Quiz Answers

Q1 = D. is comparable in terms of prognosis.

Q2 = B. False

Contributor

Stephen M. Smith, MD
Assistant Professor, Division of Anatomic Pathology
Department of Laboratory Medicine & Pathobiology
The University of Toronto/University Health Network

Head & Neck Case Review 2020-02

2020-02-13

12:05 pm

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nasal

Head & Neck Case Review

February, 2020

History

A 73-year-old man presented with right nasal obstruction and epiphora for about a year. On nasal endoscopy a smooth submucosal mass attached to the anterior part of the inferior turbinate and extending to the septum was identified. CT imaging also confirmed the presence of an ill-defined soft tissue mass confined to the nasal cavity. The patient subsequently underwent resection. H&E slides and immunostains are shown. The following stains were negative: cytokeratin AE1/AE3, CD34, S-100, SOX10, and myogenin.

Images

Virtual H&E slide

Quiz

Q1. The following genetic syndromes have been associated with this disease in children except:

A. Li-Fraumeni syndrome
B. Costello syndrome
C. Neurofibromatosis type 1
D. Beckwith-Wiedemann syndrome
E. Cowden syndrome

Q2. The most common site of disease outside the Head and Neck is the paratesticular region.

A. True
B. False

Diagnosis

Spindle Cell Rhabdomyosarcoma.

Sinonasal rhabdomyosarcoma is a rare malignant mesenchymal tumour with skeletal muscle differentiation. The peak incidence is in the first decade of life, with no significant gender predilection. The most commonly involved sites in the Head and Neck (H&N) are the paranasal sinuses, followed by the nasal cavity. Outside the H&N, it is most often encountered in the paratesticular region of children. Embryonal rhabdomyosarcoma is the most common subtype in the sinonasal cavity whereas the spindle cell subtype is rarely seen in this site.

Most lesions present as polypoid, ill-defined masses with smooth surfaces, often involving adjacent structures. Histologically, spindle cell rhabdomyosarcoma consists of proliferation of spindle cells with elongated nuclei and pale indistinct cytoplasm in a fascicular pattern. Occasional obvious rhabdomyoblasts may be seen. The stroma may variably be myxoid, fibrous, and/or hyalinized.

By immunohistochemistry, the tumor cells are positive for desmin, Myo-D1, and myogenin. Spindle cell carcinoma and spindle cell malignant melanoma are among the differential diagnoses and should be excluded by negative keratin and melanoma markers, respectively.

Genetically, most alveolar rhabdomyosarcomas harbor PAX3-FOXO1 fusion and a small subset PAX7-FOXO1. Pediatric spindle cell rhabdomyosarcomas, however, show NCOA2 rearrangement. Rhabdomyosarcomas may be associated with genetic syndromes including Li-Fraumeni syndrome, Costello syndrome, Neurofibromatosis type 1, and Beckwith-Wiedemann syndrome.

Overall, the prognosis is poor in the sinonasal region and complete resection is difficult because of the location.

References

Nascimento AF, Fletcher CD. Spindle cell rhabdomyosarcoma in adults. Am J Surg Pathol. 2005;29(8):1106–1113.
Smith MH, Atherton D, Reith JD, Islam NM, Bhattacharyya I, Cohen DM. Rhabdomyosarcoma, Spindle Cell/Sclerosing Variant: A Clinical and Histopathological Examination of this Rare Variant with Three New Cases from the Oral Cavity. Head Neck Pathol. 2017;11(4):494–500. doi:10.1007/s12105-017-0818-x
Carroll SJ, Nodit L. Spindle cell rhabdomyosarcoma: a brief diagnostic review and differential diagnosis. Arch Pathol Lab Med. 2013;137(8):1155–1158. doi:10.5858/arpa.2012-0465-RS

Quiz Answers

Q1 = E. Cowden syndrome

Q2 = A. True

Contributor

Mitra Mehrad, M.D.
Assistant Professor
Department of Pathology, Microbiology and Immunology
Vanderbilt University Medical Center, Nashville, TN

Head & Neck Case Review 2020-01

1 Comment on Head & Neck Case Review 2020-01

2020-01-15

4:05 pm

thyroid

Head & Neck Case Review

January, 2020

History

A 74-year-old woman presented with respiratory failure. The patient had a 3-month history of cough and progressive dyspnea with rapidly increasing neck swelling. CT Imaging revealed massive thyromegaly and lymphadenopathy with metastases to the lung, liver, kidney, and iliac bone. Patient underwent thyroid surgical resection to relieve the airway compression. Gross examination of the thyroid showed diffuse replacement by multiple masses, the largest measuring 7.6 × 5.3 × 2.7 cm, with infiltrative borders and extension into surrounding adipose tissue. H&E slides and immunostains are shown.

Images

Virtual H&E slide

Quiz

Q1. What is the characteristic genetic alteration in this tumor?

A. t(12;15)(p13,q25) ETV6-NTRK3
B. t(2;22)(q33;q12) FEV-EWS
C. t(11;19)(q21;p13) CRTC1-MAML2
D. BRAF V600E mutation

Q2. Adjuvant therapy with radioactive iodine would be effective.

A. True
B. False

Diagnosis