Fig. 1

Oblique coronal PDFS-weighted (a, c, e, g), oblique coronal T2-weighted (b, d, h), and axial PDFS-weighted (f) MRI images in five different patients (a-b, c-d, e-f, g, h) illustrating typical MRI findings assessed in this study. a and b demonstrate tendinosis with thickening and increased intermediate signal within the supraspinatus tendon (black and white arrows). c and d demonstrate partial tears with signal abnormality in the undersurface extending to the intrasubstance in the supraspinatus tendon (black and white arrows). e and f demonstrate calcific tendinosis of the supraspinatus tendon with low density areas (white and black arrows) and edema in tendon and the subjacent bone. In addition there is slightly fluid in the subacromial/subdeltoid bursa. g demonstrates subacromial/subdeltoid bursitis with increased fluid and slightly thickening of the wall (white arrow). h demonstrates AC joint osteoarthritis with prominent undersurface osteophyte formation causing narrowing of the supraspinatus outlet (white arrows)