Non-infectious ischiogluteal bursitis: MRI findings.
OBJECTIVE
We wished to report on the MRI findings of non-infectious ischiogluteal bursitis.


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.


CONCLUSIONS
Ischiogluteal bursitis can be diagnosed with MRI by its characteristic location and cystic appearance.
Cho
Kil-Ho
KH
Department of Diagnositic Radiology, Yeungnam University College of Medicine, Nam-gu, Daegu, Korea. khcho.med@yumail.ac.kr
Lee
Sung Moon
SM
Lee
Young Hwan
YH
Suh
Kyung Jin
KJ
Kim
Sung Moon
SM
Shin
Myung Jin
MJ
Jang
Han Won
HW
D000368:Aged; D000369:Aged, 80 and over; D002062:Bursitis / Q000175:diagnosis* / Q000473:pathology; D002081:Buttocks; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007512:Ischium; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged