After treatment, imaging every 3 to 6 months is recommended for 2 years, then every 6 to 12 months for up to 5 years, and thereafter as clinically indicated.[34]National Comprehensive Cancer Network. NCCN clinical practice guidelines in oncology: biliary tract cancers [internet publication].
https://www.nccn.org/guidelines/category_1
[53]National Comprehensive Cancer Network. NCCN clinical practice guidelines in oncology: hepatobiliary cancers [internet publication].
https://www.nccn.org/guidelines/category_1
Liver function testing may be performed periodically to exclude recurring obstruction.