title: Subacute osteomyelitis of long bones: diagnostic usefulness of the "penumbra sign" on MRI.
abstract: Although subacute osteomyelitis of long bones is not uncommon, it is usually confined to metaphysis. Two unusual cases of subacute osteomyelitis that traversed a growth plate are described. There may be some radiological difficulties in distinguishing it from other malignant or benign lesions. On magnetic resonance (MR) imaging, both of the present cases showed characteristic four-layered appearance and the penumbra sign. These characteristic findings on MR imaging are considered to facilitate establishing the radiologic diagnosis.
authors.affiliation: Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan. tmarui@med.kobe-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Marui
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Akisue
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Nakatani
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Hitora
authors.forename: Keiko
authors.initials: K
authors.lastname: Nagira
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yoshiya
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kurosaka
mesh_terms: D000293:Adolescent; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D010019:Osteomyelitis / Q000175:diagnosis*; D011859:Radiography; D013977:Tibia / Q000000981:diagnostic imaging / Q000473:pathology*