====== Anterior cerebral artery aneurysm ======

===== Classification =====

[[Fusiform anterior cerebral artery aneurysm]]

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[[Anterior cerebral artery]] (ACA) aneurysms are divided into five groups which include:

1.- [[Proximal anterior cerebral artery aneurysm]] or [[A1 aneurysm]]s.

2.- [[Anterior communicating artery aneurysm]]s

3.- [[Proximal pericallosal artery aneurysm]] or [[A2 aneurysm]]s

4.- Classical [[pericallosal artery aneurysm]] or A3 aneurysms curving around the genu

5.- A4 aneurysm 

6.- A5 aneurysms which include distal branch aneurysms.

Weisberg reviewed the CT findings in 40 patients with ruptured aneurysms of the anterior cerebral or [[anterior communicating artery]]. Within 3 days of the [[ictus]], the common patterns included blood in the [[pericallosal cistern]] and [[interhemispheric fissure]], blood in the caval-septal region, unilateral or bilateral frontal hematoma, and diffuse symmetric intraventricular and basal cisternal blood
((Weisberg LA. Ruptured aneurysms of anterior cerebral or anterior communicating
arteries: CT patterns. Neurology. 1985 Nov;35(11):1562-6. PubMed PMID: 4058745.)).

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Preoperative evaluation of cerebral vasculature with a cerebral angiogram or high-resolution [[digital subtraction angiography]] is essential as multiple aneurysms are commonly associated with [[anterior cerebral artery aneurysm]]s