Dermatomyofibroma

Abstract

We report a case of dermatomyofibroma that, to our knowledge, is the second case reported in Brazil. About 100 cases have been reported worldwide. Dermatomyofibroma represents a rare, benign mesenchymal neoplasm of fibroblastic/myofibroblastic differentiation, with prolonged evolution and little or no symptoms. It most commonly occurs in young women and male children. Dermatomyofibroma can be easily confused with other clinical entities, which could lead to unnecessary treatments. Therefore, it is important that dermatologists and pediatricians suspect and start to consider this hypothesis in their diagnostic exercises.

Figure 1

Brown erythematous macule, about 3 cm in size, asymptomatic, and biopsy scar on the posterior region of the right shoulder

Figure 2

Fusiform cells without atypia, with wavy nuclei; pink cytoplasm, non-defined cell limits boundaries (HE, high magnification)

Figure 3

Fusocellular proliferation through the skin appendages, without destroying them or changing their morphology (HE, low magnification)