MR angiography of peripheral posterior inferior cerebellar artery aneurysms.
OBJECTIVE
A small subset of posterior inferior cerebellar artery (PICA) aneurysms arise distal to the vertebral artery origin of the PICA. We present two such cases seen on conventional angiography and MR angiography (MRA).


METHODS
The findings in two patients are presented. In one the aneurysm presented with subarachnoid hemorrhage. The second was found incidentally but later ruptured.


RESULTS
There was good agreement between the appearance of the aneurysms on MRA and conventional angiography.


CONCLUSIONS
Awareness of the possibility of peripheral PICA aneurysms and their features is important. The positioning of the volume of excitation for MRA may have to be adjusted to include a very low PICA caudal loop.
Department of Radiology, Winthrop-University Hospital, Mineola, NY 11501.
D B
DB
Price
L J
LJ
Miller
D001158:Arteries / Q000473:pathology; D002526:Cerebellar Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D002531:Cerebellum / Q000098:blood supply*; D002533:Cerebral Angiography; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged