The imaging findings and clinical symptoms are consistent with calcific tendinitis of the infraspinatus tendon.

Calcific tendinitis is a relatively common condition that frequently affects the rotator cuff due to calcium hydroxyapatite deposition within the tendon, with an occurrence rate of 80% in the supraspinatus, 15% in the infraspinatus, and 5% in the subscapularis tendon.

This is a self-limiting condition; however, several treatment options have been proposed to alleviate pain and restore mobility for patients, including:

• oral analgesics/anti-inflammatory medications

• local anesthetic or steroid injection under the acromion

• barbotage (ultrasound-guided needling and lavage)

• extracorporeal shock wave therapy (ECSW)

• shoulder arthroscopy