Hydroxyapatite Deposition Disease as Cause of AtraumaticShoulder Pain: A Case Report

Introduction: Hydroxyapatite deposition disease (HADD) is caused by the presence of hydroxyapatite crystals in periarticular spaces oftentimes leading to inflammation, pain, and decreased range of motion. Case Report:A 40-year-old right hand dominant female presented with three days of atraumaticright shoulder pain. Radiographs of the right shoulder were negative. Computed tomographyrevealed a hydroxyapatite deposit adjacent to the acromioclavicular joint.The patient was managedwith nonsteroidal anti-inflammatory drugs and a referral to orthopedic surgery. Conclusion: Many instances of HADD will not be diagnosed on plain radiographs, and heightened awareness will provide confidence when ordering confirmatory imaging. Management is typicallyconservative, however, referral to orthopedic surgery is recommended to ensure improvement and toassess the need for more invasive procedures.