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Removal of growth or tissue of front of skull base within membranes covering brain

Removal of growth or tissue of lower skull base outside brain membrane

Removal of growth or tissue of middle skull base within brain membrane

Occlusion of head or neck artery

Insertion of stent in blood vessel of head

Infusion of chemical agent into artery of brain with Insertion of tube and imaging, initial territory

Infusion of chemical agent into artery of brain with Insertion of tube and imaging, each additional territory

Complex repair of abnormal artery-vein connection in upper brain

Repair of complex aneurysm of neck artery

Connection of arteries of head