A full-term baby girl, who was delivered vaginally after 18 hours of labor, had irregular purplish blue markings on her left arm and right leg. She weighed 8 lb 13 oz, and her Apgar score immediately after delivery was 9. Exposure to room temperatures cooler than the womb caused the bruises to intensify, producing a stained-glass appearance. The affected leg was slightly atrophied compared with the nonaffected leg. Manipulation of the extremities caused no distress. Neither of the girl’s parents had a medical history of any significance, and the pregnancy had been unremarkable. Coagulation studies were within normal limits, so the markings were assumed to be bruises from a traumatic delivery. However, eight weeks later they remained unchanged.
What is the diagnosis?
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