title: Metastatic carcinoma to pituitary adenomas: a report of two cases.
abstract: Two cases of carcinoma metastatic to pituitary adenomas are reported. One patient had a prostatic adenocarcinoma, giving rise to metastases in an adenoma found incidentally at autopsy; clinically and immunohistochemically, the adenoma showed lack of endocrine activity. The second patient had symptoms of cortisol excess. A corticotroph adenoma associated with a malignant neoplasm was diagnosed ante mortem; at autopsy a pancreatic endocrine neoplasm was found. Immunohistochemistry and electron microscopy were important in elucidating the primary tumor. The formation of extraportal vascular channels and altered blood flow may have importance in the pathogenesis of cancer metastases to pituitary adenomas.
authors.affiliation: Department of Pathology, St. Michael's Hospital, University of Toronto, Ontario, Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Ramsay
authors.forename: K
authors.initials: K
authors.lastname: Kovacs
authors.forename: B W
authors.initials: BW
authors.lastname: Scheithauer
authors.forename: C
authors.initials: C
authors.lastname: Ezrin
authors.forename: M H
authors.initials: MH
authors.lastname: Weiss
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis / Q000473:pathology; D000236:Adenoma / Q000175:diagnosis / Q000556:secondary* / Q000648:ultrastructure; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000175:diagnosis / Q000473:pathology; D010911:Pituitary Neoplasms / Q000175:diagnosis / Q000556:secondary* / Q000648:ultrastructure; D011471:Prostatic Neoplasms / Q000175:diagnosis / Q000473:pathology