Linear dermatomyofibroma.

Dermatomyofibroma is a rare, plaque-like, cutaneous myofibroblastic proliferation that usually presents as a 1-2 cm, firm, dermal plaque, often with brown-red discoloration. We report an example of dermatomyofibroma presenting as a poorly defined, linear, indurated area, 8 cm in length, on the posterior aspect of the neck of a 20-year-old female. This lesion is the largest dermatomyofibroma reported to date and the first to demonstrate a linear distribution.