of patients with acute cholecystitis , 70 % met all of the following sonographic criteria : ( 1 ) gallbladder wallthickening of 5 mm or greater , ( 2 ) gallbladder wall anechoicity , ( 3 ) gallbladder distension , as determined by an external anteroposterior width of 4 cm or greater , and ( 4 ) cholelithiasis .
C0016976
gallbladder
C0008350
cholelithiasis