Imaging indications in polymyalgia rheumatica

Abstract

With the recent improvement in technology, various imaging modalities are increasingly being used in the diagnosis and monitoring of musculoskeletal diseases. Although polymyalgia rheumatica (PMR) is traditionally considered a ‘clinical diagnosis’ the utility of imaging for diagnosis, assessment of disease severity and treatment response in PMR is increasingly recognized. Imaging not only adds to the diagnosis by detecting PMR-specific features, but also helps to make alternative diagnoses. Recently published classification criteria emphasize the importance of ultrasonography, an easily available imaging modality in the diagnosis of PMR. Herein we discuss the role and limitations of ultrasonography, MRI and fludeoxyglucose-PET scanning in the management of PMR, particularly in the diagnosis, and distinguishing it from its numerous mimics.