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Guide Catheters – In the endovascular treatment of cerebral aneurysms, these flexible tubes are introduced through an access point to the arteries (typically through an artery in the groin) and moved through the arteries into the patient’s carotid artery (the principal artery in the neck). Once positioned in the carotid artery, the guide catheter functions as a working channel through which smaller devices, like microcatheters, may be introduced into the brain.

Guidewire – A thin, usually flexible wire that can be inserted into a confined or tortuous space to act as a guide to facilitate passage of instrumentation, such as a catheter. Used in the endovascular treatment of cerebral aneurysms.

Gamma Knife – A device that is used to deliver high-dose, focused beam radiation for the treatment of AVMs (and also tumors) of the brain. This is one of two commonly used ways to perform radiosurgery.

GDC – Short for Guglielmi Detachable Coils, it is the type of coils most typically used to treat aneurysms today.