title: Alveolar soft part sarcoma of the paranasal sinuses masquerading as a giant invasive pituitary adenoma.
abstract: Alveolar soft part sarcoma (ASPS) is a relatively rare tumor that mostly presents as a slow growing mass in the deep soft tissue of the extremities. A substantial number of cases in children occur in the head and neck region; however, in any age group, it is very rarely reported in the sinonasal region. We report a case of ASPS of the paranasal sinuses with sellar extension in a 25-year-old man that masqueraded as a giant invasive pituitary adenoma. This is only the fifth case of sinonasal ASPS in literature. The clinical and radiological diagnoses were misleading, but an extensive pathology workup including electron microscopy helped reach an accurate diagnosis in this unusual case.
authors.affiliation: Department of Pathology, All India Institute of Medical Sciences (AIIMS), New Delhi 110029, India.
authors.forename: Geetika
authors.initials: G
authors.lastname: Singh
authors.forename: Mehar Chand
authors.initials: MC
authors.lastname: Sharma
authors.forename: Vaishali
authors.initials: V
authors.lastname: Suri
authors.forename: Chitra
authors.initials: C
authors.lastname: Sarkar
authors.forename: Ajay
authors.initials: A
authors.lastname: Garg
authors.forename: Manmohan
authors.initials: M
authors.lastname: Singh
mesh_terms: D000236:Adenoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000648:ultrastructure; D000328:Adult; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D046529:Microscopy, Electron, Transmission; D009361:Neoplasm Invasiveness; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000648:ultrastructure; D010911:Pituitary Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000648:ultrastructure; D011859:Radiography; D018234:Sarcoma, Alveolar Soft Part / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000648:ultrastructure