title: The "Penumbra Sign" on Magnetic Resonance Images of Brodie's Abscess: A Case Report.
abstract: This report presents the "penumbra sign" of a Brodie's abscess in a 69-year-old male patient. The lesion was located in the proximal metaphysis of the left tibia. Histopathology confirmed the diagnosis of subacute osteomyelitis. The penumbra sign on magnetic resonance (MR) images is a helpful sign for the diagnosis of Brodie's abscess.
authors: Department of Orthopedics and Hand Surgery, Imam Khomeini Hospital, Urmia University of Medical Sciences, Urmia, Iran.
authors: Ahmadreza
authors: A
authors: Afshar
authors: Afshin
authors: A
authors: Mohammadi
keywords: Abscess; Magnetic Resonance Imaging; Osteomyelitis