<prompt> Comment on the X-rayAcute osteomyelitisChronic osteomyelitisBrodies abscessAdamantinoma  <response>: Ref. Textbook of Orthopedics, Ebnezar. Page.527 Brodie abscess is an intraosseous abscess related to a focus of subacute pyogenic osteomyelitisTypically these present in children with unfused epiphyseal plates, more frequently in boys. S. aureus most common; cultures often negativeThe 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 