The lateral bursal extension beneath the deltoid represents the subdeltoid component of the subacromial-subdeltoid bursal complex. This lateral portion is frequently thickened in calcific tendinopathy of the supraspinatus insertion — calcium deposits from the tendon may decompress into this bursal extension, producing the hyperacute calcific bursitis presentation with severe lateral shoulder pain.
Allows the deltoid to glide over the rotator cuff footprint during arm abduction
Acute calcific tendinitis with bursal rupture produces the most severe shoulder pain encountered in clinical practice — the patient holds the arm rigidly against the body and cannot tolerate any movement. Needling and lavage of the calcium deposit under ultrasound guidance provides immediate decompression relief. The white toothpaste-like calcium efflux confirms successful decompression.
Calcium deposit rupture from the supraspinatus tendon into the subdeltoid bursal extension producing hyperacute shoulder pain managed with ultrasound-guided needling and lavage.
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