| [ Summary ] |
Endoscopic ultrasonography using an ultrasound endoscope and intra bilio-pancreatic ductal ultrasonography (IDUS) can produce precise images of bile ducts and surrounding tissues or organs. From these images, tumor expansion of the bile duct due to malignancy is possible. Endoscopic ultrasonography (EUS) examination of the bile duct is performed through the duodenal wall and IDUS study is made by inserting the ultrasound mini-probe into the bile duct.Based on the TN(M) classification, 24 cases of extra hepatic bile duct malignancy were discussed. The diagnostic accuracy of EUS was 83%, and that of IDUS was 88%. Those results were superior to those of other imaging diagnostic tools such as US, CT, or angiography. Diagnosis of tumor expansion and bile duct malignancy is important in deciding on the correct choice of therapeutic techniques, with which can expand the quality of life for patients. |