RICH- or not?

This female infant presented at birth with a firm mass on the right lower leg. On day 2, her platelet count was 47 × 109, with a normal fibrinogen level of 1.9 g/L. On day 4, she received her first platelet transfusion after the platelet count had dropped to 19 × 109. Fibrinogen was 0.8 g/L and the international normalized ratio (INR) was 1.1. She was referred for further assessment on day 5. On examination she had a firm, warm, non-pulsatile bluish mass on the medial aspect of the right lower leg, which did not appear to be tender.

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