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A. Longitudinal US of the first metatarsophalangeal joint (MTP 1) shows a hyperechoic tophus with a surrounding hypoechoic rim (arrows), present in a patient with podagra. B. Longitudinal US of MTP 1 shows a snowstorm appearance (arrowheads) and tophus formation with a surrounding anechoic rim (arrows) with hyperemia.
