Assertion: gout's sign | /r/DefinedAs | a hyperechoic signal
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text: The double-contour sign is defined as a hyperechoic signal overlying an anechoic signal; this sign is more than 96% specific, although the exact rate varies widely among joints.24-26 Musculoskeletal ultrasound also may double as a medium for guided aspiration of a tophus or the involved joint.