“…US can show effusion in the bicipital groove, thickened axillary pouch, and hypervascular hypoechoic tissue at the rotator interval in patients with FS [ 17 , 18 , 19 , 20 , 21 , 22 ]. Both PMR and FS can show similar findings in a shoulder US, suggesting tenosynovitis and glenohumeral synovitis [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. However, the typical US findings have not been clearly established in either disease entity.…”