-Case Reports-

Pseudomyogenic Hemangioendothelioma

Shin-ichi Ansai¹, Maya Morimoto² and Satoshi Akaishi²

¹Division of Dermatology and Dermatopathology, Nippon Medical School Musashi Kosugi Hospital, Kanagawa, Japan
²Division of Plastic and Reconstructive Surgery, Nippon Medical School Musashi Kosugi Hospital, Kanagawa, Japan

Pseudomyogenic hemangioendothelioma (PMHE) is a new entity. It is an intermediate soft tissue tumor clinically and/or histopathologically mimicking some other high-grade malignant tumors and some inflammatory diseases. We report a case of PMHE on the left plantar surface of a 28-year-old woman. Histopathological examination of the resected specimen revealed spindle and epithelioid cells with plump and atypical nuclei proliferated in the dermis and subcutaneous fat tissue with marked fibroplasia. Both spindle and epithelioid cells had abundant eosinophilic cytoplasm. Neoplastic cells were diffusely positive for AE1/AE3, CK7, vimentin, CD31, FLI-1, ERG, and INI-1. From those findings, we made the diagnosis of PMHE. We describe the main points of differentiation between PMHE and diseases that have similar clinical and/or histopathological findings, including cellular dermatofibroma, spindle cell squamous cell carcinoma, epithelioid sarcoma, epithelioid hemangioendothelioma, epithelioid angiosarcoma, nodular or proliferative fasciitis, and granulomatous fibrosing granulation tissue due to a ruptured epidermal cyst.

J Nippon Med Sch 2019; 86: 126-130

Keywords
pseudomyogenic hemangioendothelima, epithelioid sarcoma, keratin, CD31

Correspondence to
Shin-ichi Ansai, MD, PhD, Division of Dermatology, Nippon Medical School Musashi Kosugi Hospital, 1-396 Kosugi-cho, Nakahara-ku, Kawasaki, Kanagawa 211-8533, Japan
shin8113@nms.ac.jp

Received, August 17, 2018
Accepted, November 8, 2018