A Coexisting Pilocytic Astrocytoma and a Prolactinoma: A Case Report of Collision Tumors and Literature Review.

Pituitary adenomas and gliomas constitute two of the most common primary intracranial tumors. However, their coexistence as collision tumors is relatively rare and few similar reports could be identified in the literature. In this study, we report a case of a 64-year-old male patient with a prolactinoma and a pilocytic astrocytoma in collision. The patient underwent both an endoscopic transsphenoidal approach and a subfrontal craniotomy, achieving a gross total resection of the concomitant lesions in the sellar and suprasellar regions. Postoperatively, the patient's preoperative bitemporal hemianopsia resolved and no new deficits occurred. At his six-month follow-up, he remained free of neurologic deficits. Although causative factors are yet to be determined for these tumors in collision, their nonsyndromic coexistence could point to a common genetic linkage which will help to shed light on their natural history of occurrence.