Endovascular papillary angioendothelioma (also known as a "Dabska tumor", "Dabska-type hemangioendothelioma," "Hobnail hemangioendothelioma," "Malignant endovascular papillary angioendothelioma," "Papillary intralymphatic angioendothelioma") is a rare low-grade angiosarcoma that presents as a slow-growing tumor on the head, neck, or extremity of infants or young children.