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Microcatheter – A very small catheter used to deliver diagnostic and therapeutic agents such as embolic devices used in the endovascular treatment of cerebral aneurysms. Over-the-wire microcatheters are fed along a guide wire to the area of the body for treatment. Flow-directed microcatheters utilize the blood flow within the vessel to direct the microcatheter through the vascular system.

MRI – Short for magnetic resonance imaging. This is a special radiologic test that allows for excellent imaging of the brain. Paradoxically, MRI does not show up fresh blood as well as CT, so if bleeding from an aneurysm is suspected, CT is a better test.

MRA – Short for magnetic resonance angiography. This test can detect most aneurysms and is often performed as a screening measure when an aneurysm is suspected.