Acute subarachnoid hemorrhage from a small ACOM aneurysm

The images presented include an axial unenhanced CT, a coronal MIP from the CTA, and a 3D magnified view of the aneurysm from the CTA, obtained using volume rendering technique (VRT). The latter shows the distal internal carotid artery, the two anterior cerebral arteries, and the small multi-lobulated aneurysm originating from the ACOM, near its origin from the anterior cerebral artery on one side. There is diffuse acute subarachnoid hemorrhage, symmetric in distribution (thus favoring the diagnosis of an ACOM aneurysm), filling the suprasellar cistern and sylvian fissures.

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Part of the on-line supplement to Neuroradiology – The Essentials with MR and CT (© 2015)