Aneurysm, saccular
An aneurysm is a localized widening (dilatation) of an artery, vein, or the heart.
At the area of an aneurysm, there is typically a bulge and the wall is weakened and may rupture.
The word 'aneurysm' comes from the Greek 'aneurysma' meaning 'a widening.' A saccular aneurysm resembles a small sack.
From the Latin 'sacculus' meaning a small pouch.
A berry aneurysm is typically saccular