Blood blister-like aneurysm

Case contributed by Maxime St-Amant
Diagnosis probable



Patient Data

Age: 70 years
Gender: Male

There is a moderate stenosis of the basilar artery just proximal to the origin right AICA.

There is a focal outpouching in the anterior aspect of the basilar artery after the origin of the right AICA with a neck larger than the actual diameter of the outpouching. This apperance suggests a blood blister-like aneurysm.


The red arrow shows the wide-neck basilar aneurysm.

Case Discussion

The proximal narrowing of the basilar artery is either due to sequela of a previous dissection or noncalcified atherosclerosis. Blood blister-like aneurysm are known to arise post-dissection amongst other etiologies.

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