Hi and welcome to Healthcaremagic. Thank you for your query. I understand your concerns and I will try to help you as much as I can.
If there is a stone in common bile duct then this can be treated endoscopically with ERCP or by open surgery. It is always better to do ERSCp which is less invasive however sometimes it may not be feasible and surgery is the only option. If this obstruction is caused by tumor
then he should undergo surgery. Dilated bile duct means that there is serious issues and hiperbilirubinemia and treatment should be started as soon as possible to prevent serious consequances. It can be treated with medications unfortunately.
I hope I have answered you query. If you have any further questions you can contact us in every time.
Kindly regards. Wish you a good health.