case_images: PMC3964674_01
case_images: Plain lateral x-ray of the knee showing prepatellar soft tissue swelling; no obvious bony lesion
case_images: rcse9501-e4-01.jpg
case_images: PMC3964674_01_rcse9501-e4-01.jpg
case_images: fig1
case_images: An x-ray showed a large prepatellar swelling but no obvious bony pathology (Fig 1).  
case_images: Lateral x-ray of the knee showing a focal lytic lesion in the patella with overlying soft tissue swelling and minor periosteal reaction; features consistent with a Brodie's abscess
case_images: rcse9501-e4-02.jpg
case_images: PMC3964674_01_rcse9501-e4-02.jpg
case_images: fig2
case_images: Further knee radiography showed a central nidus of necrotic bone in the patella (Fig 2).
case_images: T1 weighted magnetic resonance imaging showing a 16mm x 12mm well defined lucency with central calcific densities, suggesting chronic osteomyelitis with sequestrum
case_images: rcse9501-e4-03.jpg
case_images: PMC3964674_01_rcse9501-e4-03.jpg
case_images: fig3
case_images: Magnetic resonance imaging (MRI) confirmed osteomyelitis (Fig 3).