Muslin-induced optochiasmatic arachnoiditis is a rare complication following surgical repair of an intracranial aneurysm but should be suspected in any delayed visual loss after aneurysm repair in which muslin was used. A 52-year-old male underwent clipping and muslin wrapping of a ruptured aneurysm of an anterior communicating artery. Eight months following surgery, the patient developed progressive visual loss, resulting in a bitemporal hemianopsia. Neuroimaging confirmed a suprasellar mass but no recurrent aneurysm. The patient was treated with prednisone and had significant improvement of his vision. Muslin wrapping of aneurysms should probably be avoided in aneurysms near the optic apparatus.
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