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. 2021 Feb 6;24(2):131–142. doi: 10.1007/s40477-021-00563-1

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© The Author(s) 2021

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Fig. 11 — Sonography image depicts annular GA characterised by a ring-shaped (white arrow) circumferential thickening of the gallbladder wall, which usually involves the central part that divides the lumen of the gallbladder into two separate compartments and biliary sludge in the affected area (yellow arrow)