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A 21-day-old boy was brought to the emergency department with bleeding from a left neck mass. He had been born at full term with a small subcutaneous left neck mass that was suspected of being a hemangioma. The lesion rapidly increased in size and eroded through the skin. A small amount of bleeding began on the morning of presentation.
Examination revealed a 5 x 5-cm mass in the left posterior neck with an area of central ulceration. Serology revealed a platelet count of 469,000/[mm.sup.3] and a hemoglobin level of 11.6 g/dl. The activated partial thromboplastin time (aPTT), prothrombin time (PT), and international normalized ratio (INR) were normal. ...