1999 Volume 53 Pages 58-61
We evaluated usefulness of ERUS for detecting residual stone after endoscopic treatment in this study. From October 1994 to April 1998, subject are 40 cases which could not be detected by ERC after endoscopic treatment (EPBD 31, EST 9) of bile duct stone. Average age of subjects is 66.0 and sex ratio is 23 : 17.
ERUS could detect residual stone in 22.5% (9 case of 40) . Characteristics of these 9 cases with residual stone is as follows ; average number of bile duct stone is 2.2, average size is 16.1mm, and rate of employing EML is 66.7% (6/9) . Rate of residual stone with and without EML is 31.5% and 14.3%, respectively. The size of ultrasonic probe (USP) is smaller, 2.4mm in diameter, than that of per oral choledochoscope (POCS) . USP can be traversed through the channel of diagnostic duodenoscope, therefore it is not necessary to exchange a duodenoscope after endoscopic treatment, whereas POCS needs exchanging it. Further more manuplation of USP is easy, compared to POCS. However, the differention between air and stone, and detection of bile duct stone in pneumobilia is only problematic in ERUS.
We concluded that ERUS is useful for evaluating residual stone after endoscopic treatment of bile duct stone, especially in case which is treated by EML.
