Comment on the X-ray
Correct Answer: Brodies abscess
Description: Ref. Textbook of Orthopedics, Ebnezar. Page.527
Brodie abscess is an intraosseous abscess related to a focus of subacute pyogenic osteomyelitis
Typically these present in children with unfused epiphyseal plates, more frequently in boys.
S. aureus (most common); cultures often negative
The “penumbra sign” on magnetic resonance (MR) imaging is useful for discriminating subacute osteomyelitis from other bone lesions.
The penumbra sign is a rim lining of an abscess cavity with higher signal intensity than that of the main abscess on T1-weighted images
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