title: F-18 FDG PET/CT in an adult case of group B streptococcal sacroiliitis.
abstract: An adult patient presented with acute severe pelvic and low-back pain. Evaluations with CT and MRI were negative/inconclusive. F-18 FDG PET/CT localized the site of pathology in right sacroiliac-joint by demonstrating hypermetabolic activities conformal with the joint's outline, signifying infectious/inflammatory sacroiliitis. Blood culture was positive for Group B streptococcus (GBS). Antibiotic treatment was started within 24 hours from onset of symptoms, and there was almost immediate partial pain relief. GBS sacroiliitis is a rare form of septic sacroiliitis requiring prompt diagnosis and urgent treatment. This is the first report of F-18 FDG PET/CT for diagnosing GBS sacroiliitis in adults with no predisposing factors.
authors.affiliation: Department of Nuclear Medicine and PET, Hong Kong Sanatorium and Hospital, Hong Kong, China. garrettho@hksh.com
authors.forename: Chi-Lai
authors.initials: CL
authors.lastname: Ho
authors.forename: Wing Cheung
authors.initials: WC
authors.lastname: Wu
authors.forename: Sirong
authors.initials: S
authors.lastname: Chen
authors.forename: Yim Lung
authors.initials: YL
authors.lastname: Leung
authors.forename: Thomas Kam Chau
authors.initials: TK
authors.lastname: Cheng
mesh_terms: D000328:Adult; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D049268:Positron-Emission Tomography; D058566:Sacroiliitis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000382:microbiology*; D013292:Streptococcus agalactiae / Q000502:physiology*; D014057:Tomography, X-Ray Computed
chemical_list: D019788:Fluorodeoxyglucose F18