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Updated: Jun 23, 2026

Microsurgical Clip Obliteration of Middle Cerebral Aneurysm Using Intraoperative Flow Assessment
Published on: September 25, 2009
Ossified peripheral middle cerebral artery aneurysm in a 30-year-old man
Yasuhiko Hayashi1, Hiroshi Shima, Masashi Kinoshita
1Department of Neurosurgery, Kanazawa University, Takara-machi, Kanazawa, Japan. yahayashi@ns.m.kanazawa-u.ac.jp
Abstract:
A 30-year-old man presented with a history of several convulsive episodes. A CT scan showed a calcified focus in the right temporal lobe. Cerebral angiography yielded no abnormal findings. At craniotomy, the M3 portion of the middle cerebral artery was found to terminate with a blind end at the junction with the calcified mass. A pathological diagnosis of an ossified cerebral aneurysm was made. Calcified cerebral aneurysms are not rare; they are thought to be the result of intra-aneurysmal thrombosis or degenerative changes in the aneurysmal wall. However, complete mural ossification of a cerebral aneurysm is seldom seen, and ossified peripheral middle cerebral artery aneurysms are extremely rare in young individuals. The ossified aneurysm that we report developed over a prolonged period and may have arisen during childhood.
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