Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hemangioma thrombocytopenia syndrome ?
    ### Response:
    Hemangioma thrombocytopenia syndrome is characterized by profound thrombocytopenia in association with two rare vascular tumors: kaposiform hemangioendotheliomas and tufted angiomas. The profound thrombocytopenia can cause life threatening bleeding and progress to a disseminated coagulopathy in patients with these tumors.
    