• Marcus D Mazur, Philipp Taussky, Joel D MacDonald, and Min S Park.
• Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah.
• Neurosurgery. 2016 Nov 1; 79 (5): E634-E638.

Background And ImportanceAs the use of flow-diverting stents (FDSs) for intracranial aneurysms expands, a small number of case reports have described the successful treatment of blister aneurysms of the internal carotid artery with flow diversion. Blister aneurysms are uncommon and fragile lesions that historically have high rates of morbidity and mortality despite multiple treatment strategies. We report a case of rebleeding after treatment of a ruptured blister aneurysm with deployment of a single FDS.Clinical PresentationA 29-year-old man presented with subarachnoid hemorrhage and a ruptured dorsal variant internal carotid artery aneurysm. Despite a technically successful treatment with a single FDS, a second catastrophic hemorrhage occurred during the course of his hospitalization.ConclusionThis case highlights the risk of hemorrhage during the period after deployment of a single FDS. Ruptured aneurysms, especially of the blister type, are at risk for rehemorrhage while the occlusion remains incomplete after flow diversion.AbbreviationsFDS, flow-diverting stentICA, internal carotid arterySAH, subarachnoid hemorrhage.

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