Venous hypertension associated with a posterior fossa dural arteriovenous fistula: Another cause of bithalamic lesions on MR images

We report a case of a posterior fossa arteriovenous fistula (AVF) with bith alamic hyperintensity on MR images. The thalamic abnormality improved after surgery, suggesting reversible venous hypertension as the pathogenesis of the finding, as opposed to infarction. This manifestation of a posterior fo ssa AVF should be considered in the differential diagnosis of bilateral tha lamic disease.