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CT of Unusual Iliopsoas Compartment Lesions¹

¹ From the Department of Radiology, Chiang Mai University, Chiang Mai, Thailand (M.M.); and the Department of Diagnostic Radiology, Singapore General Hospital, Outram Rd, Singapore 169608 (W.C.G.P.). Recipient of a Certificate of Merit award for a scientific exhibit at the 1999 RSNA scientific assembly. Received February 2, 2000; revision requested March 9; revision received April 24; accepted April 26. Address correspondence to W.C.G.P. (e-mail: gdrpcg@sgh.gov.sg).

The authors reviewed the anatomy of the iliopsoas compartment and a spectrum of unusual lesions affecting structures in this compartment, with emphasis on the role of computed tomography (CT). Lesions in the iliopsoas compartment are caused by acute infection, tumor, or hemorrhage. The knowledge of detailed clinical data can help improve the diagnostic accuracy, particularly with regard to primary iliopsoas lesions. CT is useful for delineating the source of secondary iliopsoas lesions, guiding biopsy, and performing follow-up of treated lesions. Nonenhanced CT can help detect fresh hemorrhage, fat-containing tumor, and calcification, whereas contrast materialenhanced CT optimizes imaging of infection, tumor, and aneurysm.

Index Terms: Muscles, abnormalities, 40.656 • Muscles, CT, 40.1211 • Muscles, iliopsoas • Muscles, infection, 40.2012, 40.2025, 40.23, 40.29 • Muscles, neoplasms, 40.39