Giant unruptured aneurysm of the middle cerebral artery manifesting with epilepsy: successful surgical treatment.

A case of a giant aneurysm of the middle cerebral artery (M.C.A.), presenting with history of visual hallucinations, is described. The aneurysm was successfully excised, with disappearance of previous symptoms. The interest of the case is constituted by the very unfrequent location for an aneurysm over 3 cm in diameter, by the occurrence of epilepsy as the first symptom and by the excellent response to surgical therapy. The morphology and location of giant aneurysms, their surgical treatment and especially the problem of aneurysm-induced epilepsy are discussed.