Glossary of Terms

Aneurysm – a brain aneurysm is a bulge or ballooning in a weakened area of one or more blood vessels in the brain. This typically develops where the artery bifurcates or branches from one major vessel into two smaller ones. It often enlarges slowly, over time and becomes weaker as it grows, just as a balloon becomes weaker as it expands.

Angiography – a procedure in which a small flexible tube is threaded into one or more arteries of the brain and dye is injected while pictures are taken.

Bifurcation – the point at which there is a division of one major vessel into two branches.

Embolic coils – tiny devices used to occlude the blood flow into an aneurysm.

Endovascular – a procedure where a small catheter containing medications, miniature instruments and / or implants can be inserted percutaneously into a blood vessel for the treatment of vascular disease.

Hemorrhagic stroke – occurs when a weakened blood vessel ruptures and blood accumulates in the subarachnoid space.

Magnetic resonance imaging (MRI) scan – a radiology technique that uses magnetism, radio waves, and a computer to produce images of brain or other parts of the body. It is an accurate way of detecting brain aneurysms, tumors, etc.

Subarachnoid hemorrhage – occurs when an aneurysm ruptures, or leaks blood into the space around the brain called the subarachnoid space. This can lead to damage to the brain tissue and loss of brain function may result.

Unruptured – an aneurysm that has not burst.