Calcific Bursitis! Hydroxyapatite deposition disease (HADD) is characterized by accumulation of crystals/calcium within articulations and/or in a peri-articular distribution. We commonly see HADD at the rotator cuff tendons, which is usually asymptomatic. However, when shoulder pain is related to the HADD seen on imaging studies, then we make the diagnosis of calcific tendinopathy. In the shoulder we can also see HADD within the subdeltoid/subacromial bursa (calcific bursitis) and within the glenohumeral joint (also known as Milwaukee’s shoulder). A paper published on 1931 argued that “calcific bursitis” was a misnomer, given the belief that the calcium in bursitis isn’t actually deposited in the walls of the bursa but rather shed from the adjacent tendon. Almost 50 years later, the pathophysiology of HADD is still not well understood. Regardless, most radiologists will distinguish the precise location of the Hydroxyapatite deposition, which is easy to determine on imaging studies – tendon > bursa > intra-articular. The treatment and prognosis varies depending on location, so be precise in your dictation! 
Also, image guided barbotage of calcific bursitis is usually technically easier than with calcific tendinopathy.
