Incidental rhabdomyomatous mesenchymal hamartoma.

Rhabdomyomatous mesenchymal hamartoma (RMH) is a rare congenital tumor of the dermal and subcutaneous tissues, often presenting as a papule or a pedunculated or sessile mass at the midline on the head and neck. Although RMH is benign, some cases have reported associations with other congenital and syndromic anomalies. Thus, an accurate diagnosis is important, as an internal or systemic evaluation of the patient may be warranted. We report a case of a solitary RMH on the midline upper chest in a healthy 15-year-old girl.