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Fig. 4A —16-year-old girl with multiple traumatic injuries in head. Initial unenhanced CT (not shown) showed hyperdensity in right internal jugular vein (IJV) and sigmoid sinus that was suspicious for venous thrombosis. Findings were confirmed on CT venography, MRI, and conventional venography. Axial source images from CT venography. Thrombus in IJV (asterisk, A) and sigmoid sinus (black arrow,B) is clearly shown as filling defect. Note collateral veins (white arrow, A) arising from right IJV.