Intraosseous myofibroma simulating an odontogenic lesion.

Myofibroma is a rare benign nodular tumor of the soft tissues, bones, or internal organs, and may affect both children and adults. It is mostly found in the head and neck region, although uncommon in the jaw bones, where only a few lesions have been described. Radiographically, it may appear as a well-defined unilocular radiolucent entity simulating a cystic or odontogenic lesion. Histopathologic findings alone may be insufficient for a final diagnosis, and immunostaining for markers such as vimentin, alpha-smooth muscle actin, desmin and S-100 may be required. Intraosseous myofibroma is a diagnostic challenge and requires careful histopathologic, immunohistochemical and radiographic correlation. The present article describes a conservatively treated intraosseous myofibroma that occurred in a 7-year-old girl. The clinical, radiographic, histopathologic and immunohistochemical features are discussed.