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Fig. 2B. —70-year-old woman presenting with acute dyspnea several days after neurosurgery procedure. Lower leg helical CT scan (6.5-mm collimation) obtained 2 min after contrast medium injection shows small hypodensity (arrow) in peroneal vein of left calf consistent with deep venous thrombosis. Color Doppler sonography did not reveal any abnormality in this area.