What’s the difference between calcific tendonitis and rotator cuff tendonitis?

What’s the difference between calcific tendonitis and rotator cuff tendonitis?

Rotator cuff tendonitis — also called tendonosis — is associated with inflammation of bursae and damage of the shoulder tendon. A bursa is a thin, membrane-lined sack that helps the tendons move across other structures. Calcific tendonitis doesn’t affect bursae directly but the bursae can become inflamed.