| Baby boy bleeds into neck hemangioma |
A 4-month-old boy presents with sudden onset of a massive hematoma on the right side of his neck and bruising on his legs. At age 2 weeks, he was noted to have developed 4 superficial infantile hemangiomas on his scalp and mid-back, as well as a 1-cm subcutaneous mass on the right side of his neck. All the lesions continued to grow, and he was started on oral propranolol at age 3 months. Although the superficial red plaques on his scalp and back stopped growing, the lesion on his neck continued to grow slowly.
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What's the diagnosis?
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