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SARS-CoV-2 has been described to cause "COVID [coronavirus disease] toes," a chilblains-like syndrome.1,2,3 A 33-year-old White woman was evaluated in the hospital for painful new-onset blue and purple nodules on the tips of 3 fingers and 2 toes, 7 days after receiving the Moderna SARS-CoV-2 vaccine (Figure 1).

Rheumatic diseases are a heterogeneous group of disorders which often affect the musculoskeletal system. Given the lack of definitive testing, there are limited diagnostic tools at clinicians’ disposal. Over the recent decades, ultrasonography has gained widespread use within rheumatology due to its accessibility, safety, and relatively low cost. This review describes the clinical utility of ultrasound as a biomarker in the diagnosis and management of several rheumatic diseases.

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