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US guided corticosteroid injection into the subacromial-subdeltoid bursa. From left to right: anterior, superior, lateral approaches. Note that the needle is parallel or slightly oblique compared to the surface of the probe. In each picture, the needle tip is inside the subacromial-subdeltoid bursa which is for didactic purposes shown as extended by synovial fluid. Gl = glenoid; TH = humeral head; Acr = acromion; arrow = needle.
