Middle cerebral artery atherosclerotic stenosis mimicking a cerebral aneurysm: pitfall in preoperative evaluation of cerebral aneurysms.

We report a case of an aneurysm-like finding of MCA with severe atherosclerosis on standard radiological evaluation, which led us to plan surgical clipping. In particular, patients, whose modalities usually performed for preoperative assessment of cerebral aneurysms, such as DSA, 3D CTA and MRA, are insufficient.