title: Non-infectious ischiogluteal bursitis: MRI findings.
abstract: 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.
authors.affiliation: Department of Diagnositic Radiology, Yeungnam University College of Medicine, Nam-gu, Daegu, Korea. khcho.med@yumail.ac.kr
authors.forename: Kil-Ho
authors.initials: KH
authors.lastname: Cho
authors.forename: Sung Moon
authors.initials: SM
authors.lastname: Lee
authors.forename: Young Hwan
authors.initials: YH
authors.lastname: Lee
authors.forename: Kyung Jin
authors.initials: KJ
authors.lastname: Suh
authors.forename: Sung Moon
authors.initials: SM
authors.lastname: Kim
authors.forename: Myung Jin
authors.initials: MJ
authors.lastname: Shin
authors.forename: Han Won
authors.initials: HW
authors.lastname: Jang
mesh_terms: 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