Disappearance of Ruptured Posterior Cerebral Artery Aneurysm Associated with Internal Carotid Artery Occlusion After Superficial Temporal Artery−to−Middle Cerebral Artery Bypass

Owing to ICA occlusion, the gap of hemodynamic stress between the posterior segment of the circle of Willis and anterior segment of the circle of Willis enlarged. This may lead to a ruptured PCA aneurysm. In this case, the aneurysm disappeared following an STA-MCA bypass. STA-MCA bypass may be one of the major reasons downregulating the gap, which can be regarded as an effective option concerning such aneurysms.