A saccular aneurysm would've been picked up on a routine physical."

Spontaneous subarachnoid hemorrhage (ruptured saccular aneurysm) section of Cerebrovascular diseases.

A saccular aneurysm (berry aneurysm) can vary in size from a few millimeters to over a centimeter.

Berry aneurysms are saccular aneurysms with necks or stems resembling a berry.

Saccular aneurysms are those with a saccular outpouching and are the most common form of cerebral aneurysm.

They should not be confused with saccular aneurysms (a.k.a. berry aneurysms), which occur in larger-sized blood vessels.

In contrast, if a saccular aneurysm ruptures, it will lead to a subarachnoid hemorrhage, typically experienced as an extremely severe headache leading to loss of consciousness.

Saccular aneurysm (a.k.a. berry aneurysm)

An intracranial berry aneurysm, also known as a saccular aneurysm, is a sac-like outpouching in a cerebral blood vessel, which can seem berry-shaped, hence the name.

"So far, the available evidence is that death was secondary to a massive cerebral hemorrhage with subsequent intracerebral bleeding following rupture of a large saccular aneurysm at the cerebellar-pontine angle.

Saccular aneurysms of the anterior cerebral circulation may be detected in up to 10% of asymptomatic patients on MRA screening, but most are small, have a low risk of spontaneous rupture, and do not merit the risk of intervention.

Other factors that are positively associated with the regression of aneurysms include being younger than a year old at the onset of Kawasaki disease, fusiform rather than saccular aneurysm morphology, and an aneurysm location in a distal coronary segment.

Onyx was approved as 'Humanitarian Use Device (HUD)' for the treatment of saccular aneurysms that are not surgically removable by the Food and Drug Administration (FDA) in the USA on April 11, 2007.