Diagnostic accuracy of musculoskeletal ultrasound in suspected polymyalgia rheumatica: a multicentre, cohort study.
BACKGROUND Diagnosing polymyalgia rheumatica is challenging, and musculoskeletal ultrasound is primarily used in diagnostically difficult situations. Previous musculoskeletal ultrasound studies in patients with polymyalgia rheumatica used case-control designs or non-representative cohorts, reducing assessment of diagno...