Extraskeletal osteosarcoma arising in myositis ossificans |
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Authors: | Eiichi Konishi Katsuyuki Kusuzaki Hiroaki Murata Yasunari Tsuchihashi John W Beabout K Krishnan Unni |
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Institution: | (1) Visiting clinician, Division of Anatomic Pathology, from Department of Pathology, Kyoto Prefectural University of Medicine, Kyoto, Japan, JP;(2) Department of Orthopedic Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan, JP;(3) Hospital Department of Pathology, Kyoto Prefectural University of Medicine, Kyoto, Japan, JP;(4) Department of Diagnostic Radiology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA, US;(5) Division of Anatomic Pathology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA, US;(6) Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA, US |
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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.
Received: 22 June 2000 Revision requested: 2 August 2000 Revision received: 14 September 2000 Accepted: 25 September 2000 |
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Keywords: | Extraskeletal osteosarcoma Malignant transformation Myositis ossificans Forearm Radiography MRI CT |
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