[Diagnosis of choledocholithiasis and residual lithiasis. Ultrasonic postcholecystectomy].

246 patients with proven common bile duct stones at surgery were studied in order to establish the accuracy of ultrasound scanning in detecting choledocholithiasis and to compare the sensitivity of real-time examinations with those performed by a static scanner. The detection of choledocholithiasis by real-time ultrasound was 45.6% compared to 26.3% for the examinations performed with a static scanner. A dilated common bile duct was detected in 83.6% using real-time scanning compared to 70.3% using a static scanner. When the common bile duct was not dilated ultrasound was unable to detect the stones. Real-time ultrasound detected 66.6% of the patients with residual choledocholithiasis compared to 23.5% of patients examined by a static scanner. Our results show that real-time ultrasound scanning is a very useful screening method in detecting choledocholithiasis and residual lithiasis.