Fibro-Osseous Pseudotumor of Toe: A Case Report

Creative Commons License

Sayar H., Yilmaz A., Bal N.

TURKIYE KLINIKLERI TIP BILIMLERI DERGISI, vol.30, no.5, pp.1720-1723, 2010 (SCI-Expanded) identifier identifier


Fibro-osseous pseudotumor (FOPT) is a benign soft tissue tumor of the hand characterized by bone differentiation zones in proliferated fibroblasts. The etiology of FOPT is not yet known. In young adults, it occurs as a fast-growing, swollen and painful tumor particularly in hand's proximal phalanx. The tumor is thought to be related to myositis ossificans. In order to avoid unnecessary radical surgery and amputation, its differential diagnosis from extraskeletal osteosarcoma is critical. We report here the case of a 30-year-old female patient with post-traumatic FOPT. At the dorsum of the left fifth toe, a partially mobile grayish-purple 0.5 cm tumor with ulcerated surface was noted. In the histopathological examination, irregular tumoral tissue was observed in the ulcer base and random bone formation at the base of the lesion. The tumor consisted of slightly pleomorphic fibroblastic cells with indistinct cytoplasmic boundaries and large nuclei, some of them containing nucleoli. Osteoblasts without atypia were also present around the trabeculae. Although FOPT is reported to be a lesion in the hand, there is a case of FOPT in the foot was presented in the literature before. In this case report, we present the second case of FOPT in the foot in English literature.