FIG 1. Patient 1, a 73-year-old man who presented with incoordination and ataxia.

A, Parasagittal T1-weighted MR image shows a low-signal-intensity lesion involving the posterior inferior aspect of the cerebellar hemisphere.

B, Axial T2-weighted MR image shows an ill-defined high-signal-intensity lesion (asterisk) in the left cerebellar hemisphere. Note multiple signal voids in the peripheral portion of the lesion.

C, Axial gadolinium-enhanced T1-weighted image demonstrates intense peripheral enhancement of the left hemispheric lesion, with a central nonenhancing area.

D, Left external carotid artery angiogram demonstrates DAVF (short thick black arrow) supplied by meningeal artery of cerebellar (Mening. a. of Cbll.) fossa coming from a neuromeningeal branch of the right ascending pharyngeal artery and left occipital artery (Occp. A.) draining through the inferior hemispheric vein (curved arrow).