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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 25:781-783, May 2004
© 2004 American Society of Neuroradiology

Case Report
BRAIN

Primitive Vertebrobasilar System Associated with a Ruptured Aneurysm

Kenji Yagi^a, Koichi Satoh^a, Junichiro Satomi^a and Shinji Nagahiro^a

^a From the Department of Neurosurgery, School of Medicine, University of Tokushima, Tokushima, Japan

Address correspondence to Kenjij Yagi, Department of Neurosurgery, School of Medicine, University of Tokushima, Tokushima, Japan

Summary: Persistent primitive lateral vertebrobasilar (PPLVB) anastomosis is a rare remnant of early fetal development whose occurrence, to our knowledge, has been reported only once. We now report a new variant in which the basilar artery was fed primarily by a PPLVB anastomosis because on one side the vertebrobasilar junction was incompletely developed and on the other it was aplastic. Aneurysmal rupture in this case may be attributable to excessive hemodynamic stress.