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Endovascular papillary angioendothelioma (EPA), known as Dabska tumor, is a very rare vascular neoplasm that usually occurs in the skin or subcutis of infants and young children. There is no previous report of EPA appearing in the oral cavity. Here, we present an exceptionally rare case of EPA of the tongue in a 67-year-old man. A well-defined, reddish tumor measuring 11 mm x 8 mm x 7 mm existed at the submucosal area of the left tongue margin. Microscopic examination of an excisional biopsy specimen revealed the endothelioid tumor cells showing a papillary growth pattern, such as blood vessel-like structures. Immunohistochemical studies showed positive reactivities for CD31, CD34, alpha-smooth muscle actin, and factor VIII-related antigen in most of the tumor cells and CD68 in some tumor cells. Based on these observations, the tumor was diagnosed as an EPA. [ABSTRACT FROM AUTHOR]

Presents the letter of reply to the comments made by Fumio Ide regarding oral endovascular papillary angioendothelioma or Dabska tumor of the tongue. Rejection of Ide's suggestion of the intravascular papillary endothelial hyperplasia (IPEH) as the pathological diagnosis; Confirmation of the diagnosis as an endovascular papillary angioendothelioma (EPA); Suggestion of the feasibility of the lesion in the case study as a mature form of IPEH instead of an EPA; Difference of opinions regarding the existence of of capsule in EPA; Importance of the glomerulus appearance on the histological feature of the EPA.