Dermatomyofibroma: a report of two cases, one occurring in a child.

Dermatomyofibroma is a recently described plaque-like dermal tumour composed of myofibroblasts that usually presents around the shoulder, axilla and posterior neck, often in young adult females. Here, we present two cases, one from the posterior axilla of a 33-year-old female and one from the posterior neck of a 7-year-old male. Both were clinically red-brown lesions with histological and immunohistochemical features diagnostic of dermatomyofibroma. There was no evidence of aggressive biologic behaviour with 3 months and 2 months follow up, respectively. While the majority of dermatomyofibromas present in postpubescent females, the 7-year-old male exemplifies a subgroup occurring in male children which appears to show a particular predilection for the posterior neck.