(1) The lesion appears to be a reactive process rather than a true neoplasm. The cause of FRP is unknown, but about one-half of patients with this lesion give a history of trauma to the area. The lesion is most common in the tubular bones of the hands and feet. In he hand, most lesions occur in the proximal phalanx. Lesions in the distal phalanx, the metacarpals, and the thumb are rare.
(2) Clinically , there is a history of gradually progressive swelling, erythema, and pain or a painful mass in the affected part. Approximately 50% of patients have a history of trauma. The symptoms often develop over one to two months, but there may be a longer history of mild or minimal symptoms or a long history of a nodule in the area. The symptoms are exacerbated by use or weightbearing on the affected bone, and improved by rest, antiinflammatories and corticosteroids. The mass may decrease in size if steroids are given. There are no constitutional symptoms.