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Fig. 7B —25-year-old man with blunt trauma to left upper leg with open fracture of femur shaft and consequent diffuse bleeding and emphysema in soft tissue underwent MDCT angiography of upper leg. Transverse CT image distal to A shows segmental, concentric, smooth narrowing (arrow) of superficial femoral artery indicating focal nonocclusive spasm. Image also shows dislocated bone fragments (arrowheads). Surgery confirmed patency of superficial femoral artery.