An 82-year-old woman presented to the emergency department with right-sided leg pain and paresthesias that had lasted for five days. The patient had been bedridden for several years because of dementia.Examination revealed diffusely scattered cyanosis on the foot (see accompanying figure), ankle, and calf, but sparing the knee. Peripheral pulses, including popliteal, posterior tibial, and dorsal pedis, were absent on the affected side.
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