Myopericytoma-type Perivascular Myoma Arising on the Auricle of the Ear / 대한피부과학회지

ABSTRACT

The concept of perivascular myomas was recently proposed to designate perivascular myoid tumors arising from pleuripotent perivascular cells like smooth muscle cell cells, pericytes and glomus cell. They represent a histological continuum between three categories; myofibromatosis, glomangiopericytoma and myopericytoma. Myopericytoma is a rare, soft tissue tumor that primarily occurs in the skin and the subcutaneous and soft tissues of the extremities, but very few cases have been reported in other locations, which occurred in our present case. We herein report on a rare case of myopericytoma that developed on an unusual location, that is, the ear. The patient was a 35-year-old man who had a painless, slowly-growing red nodule on the upper auricle of the right ear for 5 years. The nodule was revealed to be a well-circumscribed mass composed of round to oval cells that strongly expressed smooth muscle actin. These cells were arranged in the concentrically multilayered pattern and they were surrounded by small to medium-sized vessels.