Reason: L proximal arm mass, evaluate for hematoma vs malignancy History: expanding L proximal arm mass ROTATOR CUFF: There is thickening and intermediate signal intensity of the supraspinatus indicating moderate tendinosis. There is a partial thickness tear of the anterior fibers of the infraspinatus at the level of its insertion on the greater tuberosity measuring 4 mm in the AP dimension. There is interstitial tearing of the infraspinatus more proximally. There is thickening and intermediate signal intensity affecting the infraspinatus indicating moderate tendinosis. There is partial thickness articular surface tearing of the subscapularis at the level of its insertion on the lesser tuberosity. There is no significant retraction. The teres minor muscle and tendon appear intact.SUPRASPINATUS OUTLET: There is no significant fluid within the subacromial subdeltoid bursa. Mild degenerative changes affect the acromioclavicular joint.GLENOHUMERAL JOINT AND GLENOID LABRUM: The glenohumeral joint alignment is anatomic. Mild osteoarthritis affects the glenohumeral joint. There is a small amount of fluid within the joint without evidence of a large effusion. The glenoid labrum appears intact within the limitations of a non arthrogram study.BICEPS TENDON: The tendon of the long head of the biceps appears intact. ADDITIONAL
1. Tendinosis and partial thickness tearing of the infraspinatus without significant retraction as described above. 2. Osteoarthritis of the left shoulder. 3. Lobulated collection along the anterior aspect of the mid humeral diaphysis which is incompletely imaged/characterized on this examination. Please refer to the dedicated MRI humerus report for additional details.