• J Orthop Sci · Jan 2002

    Case Reports

    Rapidly growing fibro-osseous pseudotumor of the digits mimicking extraskeletal osteosarcoma.

    • Jun Nishio, Hiroshi Iwasaki, Osamu Soejima, Masatoshi Naito, and Masahiro Kikuchi.
    • Department of Pathology, School of Medicine, Fukuoka University, Fukuoka, Japan.
    • J Orthop Sci. 2002 Jan 1; 7 (3): 410-3.

    AbstractFibro-osseous pseudotumor of the digits is a rare benign lesion characterized histopathologically by a fibroblastic proliferation with foci of osseous differentiation. We report a case of fibro-osseous pseudotumor of the digits with a rapidly growing lesion in a 30-year-old woman. Because of its rapid growth and aggressive histopathological appearance, this lesion can be mistaken for a malignant neoplasm such as extraskeletal or parosteal osteosarcoma, despite its benign clinical behavior. For a soft tissue mass in the digit with a clinicopathological feature of pseudomalignancy, the clinician should consider fibro-osseous pseudotumor of the digits as a possible diagnosis, thereby avoiding inappropriately aggressive surgery.

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