ISSN : 2146-3123
E-ISSN : 2146-3131

Fibro-Osseous Pseudotumor of the Digits
Ufuk Usta 1, Murat Baş 2, Nasuhi Engin Aydın 3, Servet Güreşçi 4
1Departments of Pathology, Medical Faculty of Trakya University, Edirne
2Department of Orthopaedic Surgery Kocatepe State Hospital, Afyon
3Department of Pathology Medical Faculty of İnönü University, Malatya
4Department of Pathology Medical Faculty of Trakya University, Edirne
Pages : 77-80


Fibro-osseous pseudotumor of the digits is a conflicting and rare benign lesion leading to serious problems and conflicts in differential diagnosis, especially with extraskeletal osteosarcoma. A 57-year-old man presented with a painful swelling in the proximal phalange of his left index finger. Direct radiography taken on admission revealed a soft tissue swelling with suspicious calcification in the proximal phalange palmar aspect of the index finger of left hand The excised specimen of, 2x1.5x0.7 cm was gray-white with a rough, somewhat irregular outer surface. Microscopic examination revealed a mesenchimal tumorous lesion with a partially degenerated and partially calcified/ ossified myxoid stroma. There were cellular areas composed of fibroblastic spindle cells, with mild-moderate nuclear atypia and moderate mitotic activity. Those cellular areas also contained osteoclast like multinucleated giant cells forming disordered groups. The final diagnosis based on histopathologic, radiographic and clinical findings was fibro-osseous pseudotumor of the digits.

Keywords : Bone diseases/pathology; diagnosis, differential; fingers; osteosarcoma
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