Dominant A1 with aneurysm

Case contributed by Jack Ren
Modality: CT

A saccular aneurysm can be seen at the bifurcation of the dominant A1 segment on the right. The left A1 segment is hypoplastic.

Case Discussion

Aneurysms occur at branch points and when anatomy is variant (e.g fenestrations, azygous ACA etc..) the incidence of aneurysms is higher than normal, presumably due to altered haemodynamic forces. 

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Case Information

rID: 23168
Case created: 26th May 2013
Last edited: 11th Jan 2016
Inclusion in quiz mode: Included

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