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Figure 3. (a) Anteroposterior (AP) and (b) lateral knee radiographs. This patient has calcium pyrophosphate deposition disease. Note the chondrocalcinosis, best seen in the lateral meniscus on the AP film and the synovial calcification seen in the suprapatellar pouch (arrow). Note that joint space loss and subchondral bony changes are most marked at the patellofemoral joint. This is a characteristic distribution for calcium pyrophosphate deposition disease involvement of the knee.
