Infraspinatus tendon: The infraspinatus tendon is most commonly torn as an extension from supraspinatus tear (postero-superior cuff tear). The infraspinatus tendon is best evaluated on posterior coronal oblique fat-suppressed T2-weighted or STIR images (F. A second look may also be carried out on the upper axial images as well as on sagittal images.
Infraspinatus tendinosis. Posterior coronal oblique fat-sat proton-density-weighted image showing focal thickening of the infraspinatus tendon fibres with abnormal high signal diagnosed as tendinosis (arrow). Also note fluid signal within the subacromial subdeltoid bursa.
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