Pericallosal Aneurysm
Findings:
Axial CT images show predominantly interhemispheric subarachnoid
hemorrhage with focal clot high in the anterior interhemispheric region.
AP, lateral, and oblique right common carotid arteriogram shows a
saccular aneurysm at the bifurcation of ACA into pericallosal and callosomarginal
arteries.
Discussion:
Aneurysms are relatively uncommon in the pericallosal
artery, and etiologies such as trauma or mycotic aneurysm should be considered.
No predisposing etiology was found in this patient.