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

J Orthop Sci. 2002;7(3):410-3. doi: 10.1007/s007760200070.


Fibro-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.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Bone Diseases / diagnosis*
  • Bone Diseases / pathology
  • Bone Diseases / surgery
  • Bone Neoplasms / diagnosis*
  • Diagnosis, Differential
  • Female
  • Fingers* / surgery
  • Humans
  • Osteosarcoma / diagnosis*