Pyomyositis: characteristics at CT and MR imaging.

Journal Article (Journal Article)

PURPOSE: To establish imaging criteria for pyomyositis (PM). MATERIALS AND METHODS: Twenty-seven computed tomographic (CT) scans and 11 magnetic resonance (MR) images obtained in 32 patients with PM were reviewed. Images in 10 patients with PM and 16 with soft-tissue masses were evaluated blindly. RESULTS: At CT, all 27 patients had muscle enlargement with heterogeneous attenuation; 26 patients had a focal fluid collection, with rim enhancement in all 18 patients who underwent contrast material-enhanced CT. Twenty-four patients had cellulitis. At MR imaging, all 11 patients had both a subtle increase in signal intensity in the affected muscle(s) on T1-weighted images and cellulitis. Nine patients had a focal fluid collection, which had high signal intensity and a hypointense rim on T2-weighted images. In six patients, a rim of increased signal intensity was seen around the collection on T1-weighted images. Six gadolinium-enhanced examinations demonstrated rim enhancement. Eight patients had fluid in the distal joint. All patients with PM were correctly identified when evaluated with the control subjects; however, there were four false-positive results. CONCLUSION: CT and MR imaging can help characterize changes that are suspicious for PM.

Full Text

Duke Authors

Cited Authors

  • Gordon, BA; Martinez, S; Collins, AJ

Published Date

  • October 1995

Published In

Volume / Issue

  • 197 / 1

Start / End Page

  • 279 - 286

PubMed ID

  • 7568838

International Standard Serial Number (ISSN)

  • 0033-8419

Digital Object Identifier (DOI)

  • 10.1148/radiology.197.1.7568838


  • eng

Conference Location

  • United States