The WES sign.
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[1] G. Börsch,et al. Gallbladder wall thickening: A frequent finding in various nonbiliary disorders—a prospective ultrasonographic study , 1987, Journal of clinical ultrasound : JCU.
[2] C. D'Orsi,et al. Dynamic cholecystosonography of the contracted gallbladder: the double-arc-shadow sign. , 1982, AJR. American journal of roentgenology.