Comment on the X-ray
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
Acute osteomyelitis
Chronic osteomyelitis
Brodies abscess
Adamantinoma