Acute Calcific Tendinitis of the Subscapularis Tendon: A Rare Case Diagnosed by Ultrasound Imaging and Treated Successfully?

Calcific tendinitis (CT) is an acute or chronic painful shoulder disorder characterised by single or multiple deposits of calcium hydroxyapatite crystals in the rotator cuff tendon or subacromial bursa leading to inflammation around deposits [1-3]. The most commonly affected tendon is the supraspinatus tendon at its insertion on the humerus trochanter , being involved in 51-82% of cases. More rarely, it is located on the infraspinatus (15-30%), the subscapularis (10%), or the teres minor (<10%) [1]. Approximately 6.8% of patients with painful shoulders are caused by CT.