Fibro-osseous pseudotumor of the thenar eminence: a rare aggressive but benign tumor.

Fibro-osseous pseudotumor is a rare benign lesion that is characterized by fibroblastic proliferation with foci of osseous differentiation. The tumor commonly involves the digits and is usually mistaken for malignancy because of its aggressive nature thus resulting in surgical over treatment. We report a patient with fibro-osseous pseudotumor that involved the thenar eminence and was managed successfully by local resection from the surrounding structures with no residual loss of function.