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Fig. 4A. —50-year-old woman with gallbladder empyema. Intraluminal echoes with sonic shadow (calipers) in gallbladder fundus and infundibulum represent gallbladder stones. Transverse sonogram reveals gallbladder wall that cannot be completely delineated from liver boundary. Poorly delineated wall is characteristic of severe inflammation. Note pericholecystic fluid and edema in triangular zone dorsal to gallbladder (arrow).