Abstract A two-month-old boy visited the hospital due to unexpected cutaneous purpura and thrombocytopenia for 2 days. The physical examination revealed a purple mass on the back. The soft tissue color Doppler ultrasound showed rich blood signals in the tissue, and the results of bone marrow puncture indicated an increased number of megakaryocytes. After the treatment with hormone and gamma globulin, the platelet count rapidly increased and maintained at a normal level. Meanwhile, the boy was given oral administration of propranolol. He was followed up for 4 months and the volume of the mass on the back was reduced significantly. He had a definite diagnosis of hemangioma and immune thrombocytopenia. As for the patients with hemangioma complicated by thrombocytopenia, knowledge of Kasabach-Merritt syndrome should be enhanced and there should be a clarification of the association between thrombocytopenia and hemangioma. There should also be an alertness for thrombocytopenia of other causes.
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