• Vin Shen Ban, Bedansh Roy Chaudhary, Kieren Allinson, Thomas Santarius, and Ramez Wadie Kirollos.
• Division of Neurosurgery, Addenbroo-ke's Hospital, Cambridge, UK.
• Neurosurgery. 2017 Jan 1; 80 (1): E170-E175.

Background And ImportanceCollision tumors are the simultaneous occurrence of more than one type of neoplasm within an anatomic space. In the pituitary sella, collision tumors are exceedingly rare, and not much is known about their etiology and prognosis.Clinical PresentationA 74-year-old man presented with a concomitant primary pituitary lymphoma (diffuse large B-cell non-Hodgkin's lymphoma; DLBCL) and follicle-stimulating hormone (FSH)-adenoma diagnosed histologically after clinical features of apoplexy prompted urgent surgical decompression and resection. Strong immunoreactivity for FSH by the lymphoma was evident. Full-body workup demonstrated no other source for the lymphoma. He subsequently underwent 4 cycles of chemotherapy and has been in remission for over 32 months. His ophthalmoplegia at presentation persisted with no further deficits.ConclusionsFour cases of collision tumors of primary pituitary lymphoma and adenoma have previously been reported. This case represents the first combination of an FSH-adenoma and a DLBCL in the literature. Prompt involvement of the hematology-oncology team contributed to the good outcome seen in this case. The putative role played by pituitary hormones in tumorigenesis is reviewed in this case report. The association is either a chance occurrence or due to the induction of lymphoma cell proliferation by the binding of FSH produced by the adenoma to the FSH receptors on the lymphoma cells.© Congress of Neurological Surgeons 2016.

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