Rhobdomyomatous Mesenchymal Hamartoma

We present the case of an 8-year-old girl who presented with a skin-colored nodule on the chin since birth. Physical examination was otherwise unremarkable. Histologically, the lesion showed haphazardly arranged or vertically orientated, mature skeletal muscle bundles in the lower dermis and subcutis. Based on these clinical and histologic findings, a diagnosis of rhabdomyomatous mesenchymal hamartoma was made. To our knowledge, this is the first reported case of this tumor in Taiwan.