AMSF tumors typically occur in adults (average age: 40 years), but have been reported in individuals aged 4 to 91 years. Individuals commonly present with a subcutaneous or less commonly intramuscular tumor located in an<unk>  (i.e. distal), dorsal (i.e. posterior side) of a limb: about two-thirds of cases occur in a finger, hand, wrist, foot, or ankle. In a minority of cases, these tumors have developed in the upper arm, thigh, shoulder, inguinal area (i.e. groin or lower, lateral abdomen), upper back, neck, temple area of the head, and in one case, the nose. Individuals commonly present with a painless, slowly growing mass in one of these areas. The size of these tumors has ranged from 1.5 to 18 cm, although one AMSF tumor that spanned the supraclavicular and infraclavicular fossa areas had a maximum diameter of 25 cm and another AMSF tumor in the thigh had a maximum diameter of 30 cm. Individuals often re-present with a recurrence of their tumor at the site of its previous surgical removal or, in rare cases, present with metastatic disease.
Acral myxoinflammatory fibroblastic sarcoma
Superficial acral fibromyxoma
Peripheral ossifying fibroma
Juvenile hyaline fibromatosis
Aggressive infantile fibromatosis
Aggressive fibromatosis
Diffuse infantile fibromatosis
Juvenile active ossifying fibroma