• Bradley N Bohnstedt, Mary Ziemba-Davis, Gary Edwards, Jacqueline Brom, Troy D Payner, Thomas J Leipzig, John A Scott, Andrew J DeNardo, Erin Palmer, and Aaron A Cohen-Gadol.
• Goodman Campbell Brain and Spine, Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, Indiana, USA.
• World Neurosurg. 2015 May 1;83(5):784-93.

BackgroundThe vicinity of brainstem and cranial nerves as well as the limited operative working space make clip ligation of posterior inferior cerebellar artery (PICA) aneurysms challenging. The small caliber of the PICA and the broad neck often associated with these aneurysms also create challenges in preserving this artery during treatment. Few data exist to compare the 2 treatment approaches for aneurysms in this location.ObjectTo assess treatment outcomes for PICA aneurysms based on mode of management and anatomical location.MethodsA prospectively maintained database was queried for PICA aneurysms treated from 2000 through 2012. Patients were categorized on the basis of their aneurysm's anatomical location, presentation status, treatment modality, and subsequent complications. Descriptive, univariate, and multivariate statistical analyses were performed.ResultsA total of 113 PICA aneurysms were identified; 11 did not undergo treatment. Of the remaining 102 aneurysms, 77% were ruptured and 64% were treated microsurgically. In the ruptured group, patients with more proximally located aneurysms such as vertebral and proximal PICA aneurysms were more likely to experience hydrocephalus and cranial nerve deficits after treatment. Endovascular therapy was less likely to cause postoperative deficit or lead to a need for percutaneous endoscopic gastrostomy. Most importantly, discharge, 6-month, and 1-year outcomes were predicted based on presenting Hunt and Hess score and patient's age, not aneurysm location or management mode.ConclusionsPICA aneurysms are challenging and require a multimodality treatment paradigm. Although microsurgery is associated with more short-term postoperative complications, presenting grade and patient's age remain the primary predictors of long-term outcome.Copyright © 2015 Elsevier Inc. All rights reserved.

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