Cavernous Sinus Endodermal Cyst: A Report of a Rare Case.

Endodermal cysts of the cavernous sinus are extremely rare. We report the case of a 36-year-old man who presented with spontaneous pain in the ophthalmic (V1) and maxillary (V2) divisions of the trigeminal nerve. Based on the preoperative imaging findings, a cystic trigeminal schwannoma was suspected. The tumor was removed via an extradural middle fossa transcavernous approach, and histological examination confirmed the diagnosis of an endodermal cyst. Endodermal cysts should be considered in the differential diagnosis of cavernous sinus tumors.