What is Pericallosal aneurysm?

Pericallosal aneurysms are ACA aneurysms arising distal to the origin of the anterior communicating artery (A2-A5) [3,10]. Although these are usually small berry aneurysms, giant and fusiform cases have been reported in the literature [4,[11], [12], [13]].

Where is a Pericallosal aneurysm?

Pericallosal cerebral aneurysms arise from the anterior cerebral arteries (ACA) and its branches distal to the anterior communicating artery (ACoA) complex. Most arise from the branching point between the callosomarginal artery and the main ACA trunk.

What size do aneurysms burst?

Mizoi et al.19) reported that for more than 1000 aneurysms the average size of ruptured ACA aneurysms was 7.6±2.9 and the average size of ruptured MCA aneurysms was 8.3±3.6 mm. There seems to be a tendency for ACA aneurysms to rupture at a relatively small size.

How are pericallosal artery aneurysms associated with other locations?

Pericallosal artery aneurysms are frequently associated with aneurysms in other locations. Ruptured pericallosal artery aneurysms frequently present with intraparenchymal hematomas because of their position in the interhemispheric fissure and frequent adherence of their dome to the surrounding pial surfaces.

Is the corpus callosum part of the pericallosal artery?

The pericallosal artery is the distal portion of the anterior cerebral artery (ACA) that courses over the superior surface of the body of the corpus callosum in the pericallosal cistern. It gives off many small branches to the corpus callosum, forming the pericallosal moustache.

Where is the callosomarginal artery aneurysm located?

Figure 4: The callosomarginal artery is a major branch of the distal ACA, the most common location for pericallosal artery aneurysms, and its dissection guides the surgeon to the aneurysm. It arises distal to the frontopolar artery and the anterior internal frontal artery, and ascends dorsally within the callosomarginal sulcus.

What kind of craniotomy do you need for a pericallosal aneurysm?

Their coincidence with other aneurysms often mandates a pterional craniotomy in addition to an interhemispheric craniotomy. Occlusive treatment of small unruptured pericallosal aneurysms (<7mm) is potentially justifiable in patients with an otherwise good prognosis.