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Fig. 4A —18-year-old man with blunt trauma to right knee causing transient posterior dislocation of knee joint, which was examined by MDCT angiography. Transverse CT image shows severe eccentric stenosis (arrow) with semilunar deformation (due to intramural hematoma) of popliteal artery lumen at level of proximal third combined with occlusion (not shown) of middle and distal thirds of popliteal artery.