Blood blister-like aneurysm is a broad-based bulge at a nonbranch point of a vessel.
Clinical presentation
Middle-aged patients, angiographically negative for subarachnoid hemorrhage.
Radiographic features
- shape: blood blister-like or half-domed shallow outpouching with wide neck
- common sites: supraclinoid ICA (dorsal wall), less likely MCA, ACA, basilar artery
- size: usually small (<6mm) mean (3mm) 1
- rapid change in size and morphology on follow up angiograms
- CT angiography: often negative
- digital subtraction angiography: the best diagnostic tool
Differential diagnosis
-
saccular aneurysm
- vessel infundibulum
- vasospasm
- atherosclerotic vascular disease