A case report demonstrates how the clinical characteristics of fibromas resemble other common tendon tumors, such as giant cell tumor of the tendon sheath. A histologic exam is needed to distinguish a fibroma of the tendon sheath from other tumors. Plain films should be considered to rule out bony involvement.
Surgical excision is required.
T umors of the Achilles tendon are a problem for athletes because they can be disabling, and they require surgical excision. Although the clinical characteristics of a fibroma of the tendon sheath resemble those of giant cell tumor, histologically they are quite different. Tumor recurrence after excision and bony involvement may influence the patient's course. There had been no trauma to the area or any associated loss of strength or sensation. The patient sought medical treatment because prolonged walking irritated the lesion.