Related Experiment Video
Updated: Apr 7, 2026

Posterior Approach for Debridement of the Psoas Abscess
Published on: March 2, 2020
RS3PE Syndrome with Iliopsoas Bursitis Distinguished from an Iliopsoas Abscess Using a CT-guided Puncture
Shoichi Fukui1, Naoki Iwamoto, Sosuke Tsuji
1Department of Immunology and Rheumatology, Nagasaki University Graduate School of Biomedical Sciences, Japan.
Abstract:
A 55-year-old man was diagnosed with remitting seronegative symmetrical synovitis with pitting edema (RS3PE) syndrome. Contrast-enhanced computed tomography for cancer screening showed a mass with low-density centers with an enhanced rim in the left iliopsoas muscle. We suspected an iliopsoas abscess and performed computed-tomography-guided puncture of the mass. Both Gram staining and the culture of the fluid were negative. We diagnosed the patient with RS3PE syndrome with iliopsoas bursitis and administered low-dose corticosteroids without antibiotics. The symptoms, including left hip pain, quickly disappeared following treatment. Clinicians should be aware that iliopsoas bursitis may resemble an iliopsoas abscess. As a result, it is important to make an accurate differential diagnosis.
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