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Published on: October 20, 2013
Non-infectious ischiogluteal bursitis: MRI findings
Kil-Ho Cho1, Sung Moon Lee, Young Hwan Lee
1Department of Diagnositic Radiology, Yeungnam University College of Medicine, Nam-gu, Daegu, Korea. khcho.med@yumail.ac.kr
Objective:
We wished to report on the MRI findings of non-infectious ischiogluteal bursitis.
Materials And Methods:
The MRI findings of 17 confirmed cases of non-infectious ischiogluteal bursitis were analyzed: four out of the 17 cases were confirmed with surgery, and the remaining 13 cases were confirmed with MRI plus the clinical data.
Results:
The enlarged bursae were located deep to the gluteus muscles and postero-inferior to the ischial tuberosity. The superior ends of the bursal sacs abutted to the infero-medial aspect of the ischial tuberosity. The signal intensity within the enlarged bursa on T1-weighted image (WI) was hypo-intense in three cases (3/17, 17.6%), iso-intense in 10 cases (10/17, 58.9%), and hyper-intense in four cases (4/17, 23.5%) in comparison to that of surrounding muscles. The bursal sac appeared homogeneous in 13 patients (13/17, 76.5%) and heterogeneous in the remaining four patients (4/17, 23.5%) on T1-WI. On T2-WI, the bursa was hyper-intense in all cases (17/17, 100%); it was heterogeneous in 10 cases and homogeneous in seven cases. The heterogeneity was variable depending on the degree of the blood-fluid levels and the septae within the bursae. With contrast enhancement, the inner wall of the bursae was smooth (5/17 cases), and irregular (12/17 cases) because of the synovial proliferation and septation.
Conclusion:
Ischiogluteal bursitis can be diagnosed with MRI by its characteristic location and cystic appearance.
