The posterior inferior cerebellar artery (PICA) is a vessel located between the intra- and extracranial circulation. The artery is characterized by a complex embryological development and numerous anatomical variants. The authors present a case of the PICA supplied by both a hypertrophic anterior spinal artery and a hypoplastic bulbar artery. This unusual arrangement somehow completes the list of previously published variants, and the spontaneous rupture of a related aneurysm confirmed the fragility of this network. The authors discuss anatomical and treatment considerations.
INCLUDE WHEN CITING Published online April 1, 2016; DOI: 10.3171/2016.1.JNS152099.CorrespondenceJoseph Gabrieli, Department of Neuroradiology, Pitié-Salpêtrière Hospital, 47 Bd de l'Hôpital, Paris 75013, France. email: firstname.lastname@example.org.
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