Nasal cavity, paranasal sinuses, nasopharynx
Benign tumors
Ectopic pituitary adenoma


Topic Completed: 1 November 2004

Minor changes: 4 March 2020

Copyright: 2004-2020, PathologyOutlines.com, Inc.

PubMed Search: Ectopic pituitary adenoma[TI]

Nat Pernick, M.D.
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Cite this page: Pernick N. Ectopic pituitary adenoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/nasalpituitaryadenoma.html. Accessed September 19th, 2020.
Definition / general
  • 2% present as primary lesion of nasopharynx or nasal cavity
  • Some may arise as Rathke pouch remnants
  • Usually chromophobe type
  • Difficult to distinguish benign and malignant tumors by histology; must depend on presence of metastases; tumors with high MIB1 but p53- have uncertain malignant potential; tumors with high MIB1 and p53 expression act like carcinomas
Case reports
Microscopic (histologic) description
  • Rosette or ribbon pattern of polygonal cells with prominent, delicate vascular stroma
Differential diagnosis
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