INTRODUCTION
Hydroxyapatite deposition disease, characterized by deposition of
calcium crystals around para-articular soft tissues, is often
monoarticular and can involve various joints, shoulder being the most
common. Other joints like elbow, wrist, hip, knee, ankle, foot, hand and
spine can also be affected.1 However, the deposition
of calcium salts in the form of an acute calcification around the
acromioclavicular joint is a rare condition.2 This
condition is usually self-limiting. Unfortunately, some patients remain
symptomatic, with no radiographic evidence of
improvement.3 This report present a case of acute
calcific periarthritis of acromioclavicular joint, presented with acute
pain of shoulder, managed conservatively.