FINDINGS Figures 125-1 and 125-2. Axial and sagittal CTA images. There is a defect in the right retromastoid occipital bone. An intensely enhancing structure passes through this defect to join the sigmoid sinus (arrow).
DIFFERENTIAL DIAGNOSIS AV malformation, AV fistula, sinus pericranii.
DIAGNOSIS Sinus pericranii.
DISCUSSION
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