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Ultrasound scan images of subacromial bursa and supraspinatus pathology. a) hypoechoic region (between calipers) indicating an intrasubstance tear within posterior fibres of supraspinatus (longitudinal view) overlying the head of humerus (white arrowhead); b) thickened subacromial bursa (calipers); c) bunching of the SAB (white arrow) under the acromion during dynamic abduction.
