 Epithelioid hemangioendothelioma is a rare vascular tumor of borderline malignancy characterized by recurrent WWTR1-CAMTA1 gene fusions in approximately 90 % of cases.     ///    "In addition, a recurrent YAP1-TFE3 gene fusion has been identified in WWTR1-CAMTA1 negative epithelioid hemangioendotheliomas. "