The formation and regression of a flow-related cerebral artery aneurysm

The authors report a patient with an aneurysm of the right cerebral posteri or communicating artery (PCoA) developing after thrombotic pseudo-occlusion of the right internal carotid artery (ICA). The aneurysm regressed spontan eously subsequent to ipsilateral ICA endarterectomy and reversal of blood f low in the PCoA. The formation and regression of the aneurysm was well docu mented by repeat cerebral digital subtraction angiography studies, computed tomography and magnetic resonance imaging. The authors conclude that the f ormation and regression of this 'flow-related' aneurysm was associated with hemodynamic changes in blood flow of the right PCoA and the right ICA. (C) 2000 Elsevier Science B.V. All rights reserved.