Basilar artery aneurysms can be graded according to their diameter into small, (<12 mm), large (12–25 mm), and giant (>25 mm) 1) 2).
Distal basilar artery aneurysms (DBAs) consist of Basilar apex aneurysm and basilar artery-superior cerebellar artery bifurcation (BA-SCA) aneurysms
Basilar aneurysms can be graded according to their diameter into small, (<12 mm), large (12–25 mm), and giant (>25 mm)