title: MRI of tuberculous pyomyositis.
abstract: OBJECTIVE
  The purpose of this article is to describe the findings of MRI in tuberculous pyomyositis (PM).
  
  
  METHODS
  The MR images of four proven cases of tuberculous PM were retrospectively reviewed and analyzed with clinical and laboratory findings. The location, signal intensity on T1- and T2-weighted spin echo images, presence of abscess, signal intensity of peripheral rim, patterns of contrast enhancement, and associated findings were evaluated.
  
  
  RESULTS
  On MR images, all cases demonstrated low signal intensity on T1-weighted images and high signal intensity on T2-weighted images in a single muscle. Abscess was seen in all cases. Peripheral rim showed subtle hyperintensity on T1-weighted images and hypointensity on T2-weighted images. After gadolinium infusion, peripheral rim enhancement was observed in all cases. Cellulitis was associated in one case. The patients clinically presented with a palpable mass of long duration.
  
  
  CONCLUSIONS
  Tuberculous PM shows characteristic findings of a well demarcated abscess with rim enhancement at MRI and can be distinguished from other soft tissue masses.
authors.affiliation: Department of Radiology, St. Vincent Hospital, Catholic University of Korea, Kyunggi-do, South Korea.
authors.forename: J Y
authors.initials: JY
authors.lastname: Kim
authors.forename: Y H
authors.initials: YH
authors.lastname: Park
authors.forename: K H
authors.initials: KH
authors.lastname: Choi
authors.forename: S H
authors.initials: SH
authors.lastname: Park
authors.forename: H Y
authors.initials: HY
authors.lastname: Lee
mesh_terms: D000038:Abscess / Q000175:diagnosis; D000293:Adolescent; D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D005682:Gadolinium; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D018482:Muscle, Skeletal / Q000473:pathology; D009220:Myositis / Q000175:diagnosis* / Q000382:microbiology; D012189:Retrospective Studies; D014376:Tuberculosis / Q000175:diagnosis*
chemical_list: D005682:Gadolinium