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Mammary-type myofibroblastoma is an uncommon mesenchymal tumor that is histologically identical to myofibroblastoma of the breast, which was first described in 1987 by Wargotz et al. (1). Mammary-type myofibroblastoma, also called extramammary myofibroblastoma, occurs in sites outside the breast. It has been established that mammary-type myofibroblastomas commonly originate from the embryonic milk-line, extending from the mid-axilla to the medial groin (2). Although mammary-type myofibroblastomas are commonly reported in the iliac area, they are rarely reported in the axillae, mid-back, retroperitoneum, or buttocks (2, 3). In fact, to the best of our knowledge, only two previous cases of mammary-type myofibroblastoma involving the buttocks have been reported. However, the radiologic findings of ultrasonography (USG) and magnetic resonance imaging (MRI) were not described in these previous reports. Thus, we here present a rare case of mammary-type myofibroblastoma occurring in the buttock and describe its USG and MRI findings.

Mammary-Type Myofibroblastoma of the Buttock: A Case Report and Review of the Literature