Kaposiform hemangioendothelioma (KHE) is a rare vascular tumor and has a high mortality in newborns when associated with Kasabach-Merritt syndrome (KMS). In two newborns with KHE and severe KMS refractory to medical treatment, emergency embolization led to clinical improvement in the acute neonatal setting by reducing tumor volume, increasing the platelet count, and improving other clotting parameters. Systemic vincristine treatment was added for further tumor control. Both patients remained symptom-free at long-term follow-up.
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