Additionally, three neoaneurysms that were found include a periophthalmic aneurysm of the right internal carotid artery, approximately 5 mm, a fusiform dilation aneurysm at the pericallosal and callosomarginal bifurcation, and a basilar tip aneurysm, approximately 1.5-2 mm and 4 mm, respectively (Figures 2(b) and 2(c)) and were assessed as Fisher grade IV.
Postoperative formal angiogram, less than 3 weeks from her previous cerebral angiogram, showed that the previously identified fusiform dilations associated with the right pericallosal and callosomarginal bifurcation segment now had a small saccular component with a neck of 5 mm and a height of 7 mm (Figure 2(b)).
The arterial and capillary phase from the left internal carotid angiogram demonstrated a number of small "corkscrew" vessels originating from the distal left
callosomarginal artery, with no obvious contribution from either anterior falcine artery, as expected from a parasagittalpresumably dural based lesion.
