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. 2025 Aug 30;15:31960. doi: 10.1038/s41598-025-17901-6

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© The Author(s) 2025

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Fig. 2 — Power Doppler (PD) sonogram. Example of ultrasound imaging showing grade 1 (mild) PD joint inflammation at the supra-patellar recess of the knee (white arrowhead pointing towards PD vascularity) in a patient with rheumatoid arthritis.