J Korean Bone Joint Tumor Soc.  2010 Dec;16(2):95-98. 10.5292/jkbjts.2010.16.2.95.

Giant Synovial Chondromatosis of the Knee Mimicking a Parosteal Osteosarcoma: A Case Report

Affiliations
  • 1Department of Orthopedic Surgery, Korea University Anam Hospital, Seoul, Korea. pjh1964@hanmail.net
  • 2Department of Radiology, Korea University Anam Hospital, Seoul, Korea.
  • 3Department of Pathology, Korea University Anam Hospital, Seoul, Korea.
  • 4Department of Radiology, Catholic University St. Mary's Hospital, Seoul, Korea.

Abstract

Synovial chondromatosis is a benign nodular cartilaginous proliferation arising in the synovium of joints. The radiolographic features of this condition are variable. Rarely, it would be confused with malignancy such as chondrosarcoma, osteosarcoma or synovial sarcoma. We report a case of primary synovial chondromatosis of the posterior aspect of the proximal tibia mimicking a parosteal osteoarcoma on the radiography, which showed a homogeneously radiopaque juxtacortical mass. However, subsequent computed tomography (CT) showed multiple intra-articular masses containing chondroid mineralization, suggesting synovial chondromatosis.

Keyword

synovial chondromatosis; parosteal osteosarcoma; diagnostic imaging

MeSH Terms

Chondromatosis, Synovial
Chondrosarcoma
Diagnostic Imaging
Joints
Knee
Osteosarcoma
Sarcoma, Synovial
Synovial Membrane
Tibia

Figure

  • Figure 1. Lateral radiograph shows a soft tissue mass (arrow) containing dense mineralization extending into the popliteal fossa. Partial attachment to the cortex as well as radiolucent cleavage plane was evident. Two small radiodense soft tissue masses (arrowheads) were initially missed on the radiograph.

  • Figure 2. CT scan demonstrates the calcified small masses with target appearance occurring in the synovium more clearly (arrowheads), as well as large mass showing (arrows) extensive ring-and-arc mineralization that represents enchondral ossification of the multiple chondral bodies.

  • Figure 3. Photomicrograph (original magnification, H&E stain ×200) shows the typical hyaline cartilaginous nodule with calcification (arrows).


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