Webster's New World Medical Dictionary

aneurysm, arterial
An aneurysm involving an
artery.
aneurysm, arteriosclerotic
An aneurysm that
occurs because a vessel wall is weakened by arte-
riosclerosis. Also known as atherosclerotic
aneurysm. See also 
arteriosclerosis.
anemia, pernicious
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aneurysm, berry
A small aneurysm that looks
like a berry and classically occurs at the point at
which a cerebral artery departs from the circular
artery (the circle of Willis) at the base of the brain.
Berry aneurysms frequently rupture and bleed.
aneurysm, brain
An aneurysm of a blood vessel
in the brain, usually due to a defect in the vessel at
birth or from high blood pressure. Rupture of the
aneurysm causes a sudden severe headache, often
with nausea, vomiting, decreased consciousness,
and can be life threatening.
aneurysm, cardiac
An outpouching of an abnor-
mally thin portion of the heart wall. Cardiac
aneurysms tend to involve the left ventricle because
the blood there is under the greatest pressure.
aneurysm, dissecting
An aneurysm in which the
wall of an artery rips (dissects) longitudinally. This
occurs because bleeding into the weakened wall
splits the wall. Dissecting aneurysms tend to affect
the thoracic aorta. They are a particular danger in
Marfan syndrome.
aneurysm, fusiform
An aneurysm that is shaped
like a spindle and widens an artery or a vein.
aneurysm, miliary
A tiny, millet-seed–sized
aneurysm that tends to affect minute arteries in the
brain and, in the eye, the retina.
aneurysm, saccular
An aneurysm that resembles
a small sack. A berry aneurysm is typically saccular.