Mycotic pseudoaneurysm in the internal carotid artery secondary to cranial base abscess diagnosed with optic neuritis: a case report.

-induced mycotic aneurysm is difficult to treat and often has poor outcomes with severe symptom progression. Early diagnosis is also difficult, and blood and cerebrospinal fluid tests often fail to reveal any findings. A 74-year-old man presented with recurrent nosebleeds in addition to symptoms of left optic neuritis.