case_images: PMC10901533_01
case_images: Plain radiograph (lateral and anteroposterior views) of the right knee.. (A) and (B) showing radio-dense shadows anterior to the distal femoral condyle, proximal to the patella and in the popliteal fossa (red arrows). Osteophyte over lateral femoral condyle proximally (green arrow).
case_images: cureus-0016-00000053173-i01.jpg
case_images: PMC10901533_01_cureus-0016-00000053173-i01.jpg
case_images: FIG1
case_images: A plain radiograph of the right knee showed a broad radio-opaque shadow of a loose body in front of the distal femoral condyle proximal to the patella with irregularity of the articular margin of the distal femur as seen in Figure 1.
case_images: Sagittal sections of MRI of the right knee joint showing joint effusion (hyper-intense areas) with proliferative chondroid nodules of the synovium (appearing iso-to hypointense) and nodularity lining the synovium anterior to the distal femur condyle and the patello-femoral articular margin proximal to the patella in quadriceps tendon (red arrow). Joint effusion and popliteal cyst (hyper-intense cystic swelling) are visualized in the popliteal fossa (green arrow).
case_images: cureus-0016-00000053173-i02.jpg
case_images: PMC10901533_01_cureus-0016-00000053173-i02.jpg
case_images: FIG2
case_images: Radio-opaque shadows are seen in the supra-patellar pouch, infra-patellar region and popliteal fossa seen in Figure 2.
case_images: Sagittal section of MRI right knee joint showing popliteal cyst (hyper-intense cystic swelling) in the popliteal fossa (green arrow) as well as joint effusion (hyper-intense area) anterior to the distal femoral condyle (red arrow). The thickening of the synovial membrane with nodularity is also visualized (blue arrow).
case_images: cureus-0016-00000053173-i03.jpg
case_images: PMC10901533_01_cureus-0016-00000053173-i03.jpg
case_images: FIG3
case_images: A & B - Histopathological section of synovial tissue from the periphery showing irregular and thickened cellular architecture (black arrow) (H&E stained, 40X).. H&E: Hematoxylin and eosin
case_images: cureus-0016-00000053173-i04.jpg
case_images: PMC10901533_01_cureus-0016-00000053173-i04.jpg
case_images: FIG4
case_images: The loose bodies excised along with the synovial tissue taken out were sent for histopathological evaluation and synovial chondromatosis associated with papillary hyperplasia of the synovial tissue was confirmed as the final diagnosis as seen in Figure 4 and Figure 5.
case_images: Histopathological section showing marginal tissues of synovial chondromatosis with hypertrophied synovium (black arrows) (H&E stained, 40X).. H&E: Hematoxylin and eosin
case_images: cureus-0016-00000053173-i05.jpg
case_images: PMC10901533_01_cureus-0016-00000053173-i05.jpg
case_images: FIG5
case_images: The loose bodies excised along with the synovial tissue taken out were sent for histopathological evaluation and synovial chondromatosis associated with papillary hyperplasia of the synovial tissue was confirmed as the final diagnosis as seen in Figure 4 and Figure 5.