Giant MCA Aneurysm
Last Updated: September 28, 2018
Middle cerebral artery (MCA) bifurcation aneurysms account for approximately 35% of all giant aneurysms. Because of their location, lateral projection, and attachment of the dome to the lobe, nearly 50% of all ruptured MCA aneurysms present with intraparenchymal hematomas. Most (80%) of these hematomas are located in the temporal lobe.
Although MCA aneurysms are most commonly seen at the MCA bifurcation, they may also be found proximally along the M1 segment or distally along the M3 or M4 segments. Each location raises different surgical and management considerations; however, the anatomic and morphologic features of MCA aneurysms render them amenable to microsurgical clip ligation as their primary treatment of choice for most patients.