Proximal pericallosal artery aneurysm or A2 anterior cerebral artery aneurysm
The pericallosal artery is the continuation of the anterior cerebral artery (ACA) and is named after the origin of the callosomarginal artery.
Proximal pericallosal artery aneurysm, better A2 anterior cerebral artery aneurysm are very rare with an incidence of 0.2-1% of all intracranial aneurysms (IA)s.