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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 20:145-147 (1 1999)
© 1999 American Society of Neuroradiology

ARTICLE

Venous Hypertension Associated with a Posterior Fossa Dural Arteriovenous Fistula: Another Cause of Bithalamic Lesions on MR Images

Glen P. Greenough^,a, Alex Mamourian^a and Robert E. Harbaugh^a

^a From the Section of Neurology (G.P.G.), the Department of Radiology (A.M.), and the Section of Neurosurgery (R.E.H.), Dartmouth-Hitchcock Medical Center, Lebanon, NH.

Summary: We report a case of a posterior fossa arteriovenous fistula (AVF) with bithalamic 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 fossa AVF should be considered in the differential diagnosis of bilateral thalamic disease.

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