To report a case of mycotic aneurysm of the cerebral basilar artery associated with bilateral endogenous aspergillus endophthalmitis.

A 41-year-old man with no underlying disease presented with decreased vision in both eyes. The patient was diagnosed with bilateral endogenous endophthalmitis, and the authors performed a vitrectomy and lensectomy on the right eye. Hyphae were detected in the vitreous sample, and systemic amphotericin was administered. Three days after the operation, the patient became comatose due to a subarachnoid hemorrhage. Aspergillus antigen was detected in the vitreous sample and in the cerebrospinal fluid. Subarachnoid hemorrhage was due to the rupture of a mycotic aneurysm of the cranial basilar artery, complicated by aspergillus infection of the central nervous system.