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Polycythemia Mimicking Venous Sinus Thrombosis

John F. Healy and Clint Nicholsa

a From the University of California, San Diego, San Diego, CA



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  		FIG 1. Unenhanced CT scans of the brain.

A, Hyperattenuation in midline of the posterior fossa (arrow) was initially misinterpreted as cerebellar hemorrhage and later misinterpreted as sinus thrombosis.

B and C, Higher sections reveal abnormally increased attenuation of straight sinus and superior sagittal sinus (arrows) caused by polycythemia.



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  		FIG 2. MR images and time-of-flight MR venogram of the brain.

A, Axial proton density-weighted (6200/105/1 [TR/TE/NEX]) MR image reveals normal flow voids in the straight sinus and sagittal sinus.

B, Contrast-enhanced T1-weighted (414/17/1) image reveals normal flow in the venous sinuses.

C, Time-of-flight MR venogram (30/6) shows normal flow in the straight sinus and superior sagittal sinus.





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X