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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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