MR anatomy of the subcoracoid bursa and the association of subcoracoid effusion with tears of the anterior rotator cuff and the rotator interval - Grainger,A.J.; Tirman,P.F.; Elliott,J.M.; Kingzett-Taylor,A.; Steinbach,L.S.; Genant,H.K. (AJR Am J Roentgenol, 2000)