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Anatomical variations of blood supply to the cerebellum are not rare [1] . We here describe the case of a 35-year-old healthy man who presented vertebrobasilar symptoms after a cervical trauma during snowboarding and a delayed clinical worsening with vomiting and drowsiness. Neuroimaging ( fig. 1 ) revealed an almost complete left hemispheric cerebellar stroke with signs of herniation. The MRI angiography demonstrated a particular blood supply to both cerebellar hemispheres by isolated superior cerebellar arteries (SCA) and a left SCA occlusion. We hypothesize that a traumatic dissection of the left SCA was responsible for its occlusion and the consecutive cerebellar infarction. This case illustrates a rare variation of blood supply to the cerebellum [2] . Received: August 7, 2009 Accepted: August 8, 2009 Published online: January 26, 2010

Atypical Blood Supply to the Cerebellar Hemispheres by Isolated Superior Cerebellar Arteries