This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Comment on the X-ray 
Select and explain. 
A. Acute osteomyelitis, B. Chronic osteomyelitis, C. Brodies abscess, D. Adamantinoma
C: Brodies abscess
Answer: C: Brodies abscess 
Explanation: 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