“ Refers to the most common appearance of subacute osteomyelitis, typically occurs from ages 2 to 15 years and is mostly due to S. aureus. ...
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Refers to the most common appearance of subacute osteomyelitis, typically occurs from ages 2 to 15 years and is mostly due to S. aureus.
PLAIN FILM
• Lucency most commonly seen in the distal metaphysis, typically tibia or femur.
• Classic appearance for a Brodie abscess is a lucency with dense surrounding sclerosis.
• Thin, lucent channel extending towards the growth plate, ‘serpentine sign’.
MRI
• Double line effect—high signal intensity granulation tissue surrounded by low signal intensity due to marked sclerosis.
• ‘Penumbra sign’—hyperintense rim on non-gadolinium-enhanced axial Tl-weighted image, due to protein-rich granulation tissue at the abscess margin.
Brodie abscess. Frontal knee radiograph demonstrating a lytic lesion within the proximal femoral metaphysis.
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