Ultrasound Reliably Identifies Calcium Pyrophosphate Deposition Disease rheumatologyadvisor.com Identification of calcium pyrophosphate deposition disease (CPPD) by ultrasound: reliability of the OMERACT definitions in an extended set of joints—an international multiobserver study by the OMERACT Calcium Pyrophosphate Deposition Disease Ultrasound Subtask Force ard.bmj.com One year in review 2017: ultrasound in crystal arthritis E. Naredo, A. Iagnocco