A case of giant hemangioma with thrombocytopenia has been presented. Isotopic studies with Cr-51 tagged platelets indicated that the basic mechanism of thrombocytopenia in this patient involved platelet sequestration in the tumor. The platelet response in the peripheral blood following irradiation of the hemangioma gives additional evidence that the thrombocytopenia is related to pathological changes within the hemangioma.

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