title: Cystic changes at supraspinatus and infraspinatus tendon insertion sites: association with age and rotator cuff disorders in 238 patients.
abstract: OBJECTIVE
  To retrospectively determine the frequency of posterior and anterior cystic abnormalities at rotator cuff insertion site on the greater tuberosity and to determine their relationship to patient age and rotator cuff disorders.
  
  
  METHODS
  Institutional review board approval was given; informed consent was waived. The study was HIPAA compliant. In 238 patients with rotator cuff diagnoses at surgery, preoperative magnetic resonance (MR) imaging studies were reviewed to localize osseous cystic changes as anterior (supraspinatus insertion site) or posterior (infraspinatus insertion site) on the greater tuberosity. If rotator cuff tear was present, tendon retraction and location of partial tear (articular or bursal surface) were recorded. Two radiologists reached conclusions by consensus. Locations of cysts were correlated to surgical cuff diagnoses: no tear, tendinopathy, partial-thickness tear, and complete tear. Prospective interpretations from original MR reports were compared with surgical results. Statistical analyses included one-way analysis of variance, chi(2), Fisher exact, and Student t tests, as well as logistic regression and receiver operating characteristic curve comparison.
  
  
  RESULTS
  There were 238 consecutive patients (150 men, 88 women; mean age, 43 years). Cysts were located at or near footprint of cuff tendon and demonstrated fluid or soft-tissue signal intensities. Posterior cysts occurred in 56.7% of shoulders and showed no statistical correlation to age or cuff diagnosis. Anterior cysts occurred in 22.7% of shoulders and were strongly associated with cuff disorders (P<.001). Controlling for cuff disorders, there was no relationship between anterior cysts and age (P>.50). Anterior cysts were more common in partial-thickness articular (48%) than in bursal (13%) tears (P<.001).
  
  
  CONCLUSIONS
  Posterior cysts were more common than anterior cysts and showed nearly random distribution among patients, regardless of age and cuff diagnosis. Anterior cysts were closely associated with cuff disorders.
authors.affiliation: Department of Musculoskeletal Radiology, Massachusetts General Hospital, 55 Fruit St, YAW 6030, Boston, MA 02114, USA.
authors.forename: L Benjamin
authors.initials: LB
authors.lastname: Fritz
authors.forename: Hugue A
authors.initials: HA
authors.lastname: Ouellette
authors.forename: Tara A
authors.initials: TA
authors.lastname: O'Hanley
authors.forename: Ara
authors.initials: A
authors.lastname: Kassarjian
authors.forename: William E
authors.initials: WE
authors.lastname: Palmer
mesh_terms: D000328:Adult; D000367:Age Factors; D000704:Analysis of Variance; D016009:Chi-Square Distribution; D003287:Contrast Media; D003560:Cysts / Q000473:pathology*; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D012189:Retrospective Studies; D017006:Rotator Cuff / Q000473:pathology*; D000070636:Rotator Cuff Injuries; D000070599:Shoulder Injuries; D012785:Shoulder Joint / Q000473:pathology; D013710:Tendons / Q000473:pathology*
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA