Skeletal Radiology

, Volume 30, Issue 1, pp 39–43

Extraskeletal osteosarcoma arising in myositis ossificans

  • Eiichi Konishi
  • Katsuyuki Kusuzaki
  • Hiroaki Murata
  • Yasunari Tsuchihashi
  • John W. Beabout
  • K. Krishnan Unni
Case Report

DOI: 10.1007/s002560000298

Cite this article as:
Konishi, E., Kusuzaki, K., Murata, H. et al. Skeletal Radiol (2001) 30: 39. doi:10.1007/s002560000298

Abstract 

A 53-year-old woman had extraskeletal osteosarcoma that developed from a soft tissue bony mass present on the volar aspect of the left wrist for 4 years. Initially, the bony mass was soft and movable, but during the first year it became hard and fixed. The patient had no history of trauma. Because the lesion did not grow or cause any symptoms, the patient did not come to the hospital until 4 years after she first noticed the lesion. Radiologically, the bony mass had features characteristic of mature myositis ossificans, showing ”eggshell” ossification. A nonmineralized soft tissue mass occurred between the surface of the radius and the bony shell. Histologically, a high-grade osteosarcoma was present between the surface of the radius and the well-differentiated bone tissue, which included fatty and hematopoietic marrow. All the findings indicated that our patient had an extremely rare case of malignant transformation of myositis ossificans.

Keywords Extraskeletal osteosarcomaMalignant transformationMyositis ossificansForearmRadiographyMRICT

Copyright information

© International Skeletal Society 2001

Authors and Affiliations

  • Eiichi Konishi
    • 1
  • Katsuyuki Kusuzaki
    • 2
  • Hiroaki Murata
    • 2
  • Yasunari Tsuchihashi
    • 3
  • John W. Beabout
    • 4
  • K. Krishnan Unni
    • 5
  1. 1.Visiting clinician, Division of Anatomic Pathology, from Department of Pathology, Kyoto Prefectural University of Medicine, Kyoto, JapanJP
  2. 2.Department of Orthopedic Surgery, Kyoto Prefectural University of Medicine, Kyoto, JapanJP
  3. 3.Hospital Department of Pathology, Kyoto Prefectural University of Medicine, Kyoto, JapanJP
  4. 4.Department of Diagnostic Radiology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USAUS
  5. 5.Division of Anatomic Pathology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USAUS
  6. 6.Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USAUS