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Updated: Jun 7, 2026

Endovascular Perforation Model for Subarachnoid Hemorrhage Combined with Magnetic Resonance Imaging (MRI)
Published on: December 16, 2021
Non-aneurysmal perimesencephalic subarachnoid hemorrhage caused by a cavernous angioma
Shadi Yaghi1, Sowmini Oomman, Salah G Keyrouz
1Department of Neurology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
Background:
Cavernous angiomas are responsible for intracranial hemorrhages, but bleeding is infrequently confined to the subarachnoid space.
Methods:
We describe an elderly, yet healthy man who sought medical attention for subarachnoid hemorrhage.
Results:
Vascular imaging failed to reveal a cerebral aneurysm, however magnetic resonance imaging done late in the course showed a cavernous angioma, on the surface of the left upper cerebellar peduncle, that had bled.
Conclusions:
The so-called "angiography-negative" subarachnoid hemorrhage could have its source in small cavernous angiomas lying on the surface of basal skull brain structures.
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