Journal List > J Korean Bone Joint Tumor Soc > v.16(2) > 1051982

Kang, Park, Lee, Kim, Park, and Lee: Giant Synovial Chondromatosis of the Knee Mimicking a Parosteal Osteosarcoma: A Case Report

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.

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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.
jkbjts-16-95f1.tif
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.
jkbjts-16-95f2.tif
Figure 3.
Photomicrograph (original magnification, H&E stain ×200) shows the typical hyaline cartilaginous nodule with calcification (arrows).
jkbjts-16-95f3.tif
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