Calcium pyrophosphate dihydrate crystals in a 9-year-old with osteomyelitis of the knee: A case report

Figure 1 Anteroposterior (left) and lateral (right) radiographs of the right knee demonstrating evidence of a joint effusion within the suprapatellar recess and Hoffa’s fat pad.

Figure 2 Magnetic resonance imaging with intravenous contrast of the right knee demonstrating a small enhancing cortical defect along the lateral border of the lateral femoral condyle, measuring approximately 6 mm, suggestive of osteomyelitis. There is a collection within the inflammatory changes of the vastus lateralis demonstrating rim enhancement measuring approximately 0.6 cm × 0.2 cm representing tiny abscess formation.