自然退縮した乳児筋線維腫

・出生時より左大腿に紅色腫瘤を認めた．

・徐々に自然退縮し，生後半年で瘢痕化した．

・腫瘍細胞はCD34陽性であった．

（「症例のポイント」より）

　

A case of spontaneously regressed infantile myofibromatosis

　

Ohsawa, Risa1）Aoki, Natsuko1）Nakajima, Hideki1）Nakajima, Kimiko1）Takahashi, Aya2）Sano, Shigetoshi1） 1）Department of Dermatology, Kochi Medical School, Kochi University 2）Department of Dermatology, National Hospital Organization Kochi Hospital

　

A 12-day-old girl presented with red tumor of about 20 mm in size with black-brown necrosis on her left thigh from birth. Histopathological findings of the lesion showed that tumor cell nest was in the dermis but not continuous to the epidermis, surrounding staghorn-like blood vessels, around which were proliferation of short spindle shaped cells. Immunohistochemistry revealed that tumor cells were positive for CD34 but negative for GLUT-1, CD31, which was expressed in intratumoral vessels. The diagnosis of infantile myofibromatosis was made. The tumor spontenously regressed in six months and left scar.