Subacromial subdeltoid bursa
The subacromial subdeltoid bursa is a synovial lined structure between the acromion and deltoid muscle externally and the rotator cuff tendons internally. The subacromial and subdeltoid components are connected in 95% of individuals. Normally it is not connected with the joint space but communication occurs in association with full thickness supraspinatus tears.
The normal bursa usually does not exceed 2 mm in thickness and is usually located posteriorly. On coronal MRI, features suggesting abnormal amount of fluid include thickness of fluid signal more than 3 mm, fluid signal medial to the level of the AC joint, and fluid in the anterior part of the bursa.
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