Infantile myofibromatosis--a solitary lesion. A case report

Infantile myofibromatosis (IM) usually manifests itself within the first 6 months of life, and is frequently present at birth. The hard, rubbery nodules may be either solitary or multiple. Solitary lesions are more common and have a marked tendency to occur in boys, while the less common multicentric disorder predominantly affects girls. Solitary nodules are usually located in the deep soft tissues, involving skeletal muscle, and usually occur in the head and neck region or trunk. The prognosis of the solitary type of lesion is excellent, the recurrence rate being very low, and distinction from the other fibromatoses of infancy is important. A case of solitary infantile myofibromatosis occurring as a congenital lesion of the back in a female infant is described.