Value of ultrasound in diagnosis: gallstones Se 100%; Acc 96.9%; PPV 96.7%; stones stuck in gallbladder neck: Se 42.8%; Sp 88%; Acc 78.1%; PPV 50%; NPV 84.6%; gallbladder wall thickness: Se 88.9%; Sp 60.7%, Acc 76.6%; PPV 74.4%, NPV 80.9%; fluid around the gallbladder: Se 82.1%; Sp 94.4%; Acc 89.1%; PPV 92.0%; NPV 87.2%; fat infiltration around the gallbladder: Se 35.7%; Sp 100%; Acc 71.9%; PPV 100%; NPV 66.7%; cholecystitis: Se 70.3%, Acc 70.3%; PPV 70.3%.