Intracranial spider aneurysm.

Cabrilo I Neurosurgery Division, Department of Clinical Neurosciences, Geneva University Medical Center, Faculty of Medicine, Rue Gabrielle-Perret-Gentil 4, 1211 Geneva, Switzerland. Electronic address: ivan.cabrilo@hcuge.ch.
Radovanovic I Neurosurgery Division, Surgery Department, Faculty of Medicine, University of Toronto, Toronto Western Hospital, Toronto, Canada.
Schaller K Neurosurgery Division, Department of Clinical Neurosciences, Geneva University Medical Center, Faculty of Medicine, Rue Gabrielle-Perret-Gentil 4, 1211 Geneva, Switzerland.