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Background Scintillating scotoma caused by optic nerve compression by aneurysm is rare. We report a case of scintillating scotoma following optic nerve compression caused by an unruptured anterior communicating artery aneurysm. Case presentation A 64-year-old woman visited our department with a scintillating scotoma. Magnetic resonance imaging demonstrated no new lesions, although her previously diagnosed anterior communicating artery aneurysm had increased in size. Thus, we performed neck clipping. The operative view showed that the aneurysm compressed the right optic nerve. Her symptoms disappeared after the operation. These findings suggest that scintillating scotoma may be caused by compression of the optic nerve by the anterior communicating artery aneurysm. Conclusion Although scintillating scotoma is a common condition, aneurysms should be considered as a potential cause.

Scintillating scotoma following optic nerve compression caused by an unruptured anterior communicating artery aneurysm: a case report