Endovascular papillary angioendothelioma (Dabska tumor)

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The histological diagnosis of endovascular papillary angioendothelioma (EPA) (Dabska tumor) is controversial although the tumor is included in the World Health Organization classification. Papillary endothelial proliferation with a central hyaline core is one of the most characteristic features of EPA; however, this type of proliferation has been observed in other vascular tumors, such as angiosarcoma, retiform hemangioendothelioma and glomeruloid hemangioma. Several vascular tumors have EPA-like foci and EPA is not well defined generally. Endovascular papillary angioendothelioma may not be a distinct entity and may well include a heterogeneous group of lesions.

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