Representative imaging features of Type I and Type II calcifications. A. Type I – In situ calcification confined to the tendon, without signs of migration. Note the cortical sclerosis of the greater tuberosity adjacent to the deposit. B. Type II-a – Extension into the subacromial-subdeltoid bursa. C. Type II-b – Medial progression along the supraspinatus tendon, creating a characteristic “comet-tail” appearance.