Aggressive fibromatosis of the plantar aspect of the foot. A case report.

Distinguishing superficial plantar fibromatosis from deep fibromatosis of the plantar aspect of the foot is difficult both clinically and histologically. An illustrative case is presented. Clinical factors suggestive of aggressive fibromatosis include presentation at an age younger than 20 years, tumor dimension exceeding 3 cm (without prior surgical excision), and multicentric occurrence in the affected limb. On histological review, the absence of nodule formation favors the diagnosis of deep aggressive fibromatosis.