Hi TKriner,
Welcome to our community.
Interesting question. I referred it back to Foundation colleagues, and looking at the database used for the specialist map (posted on the Cholangiocarcinoma Foundation website), it appears that MDAnderson might have the highest volume of cholangiocarcinoma patients inferring from the data sources and definitions inherent in this particular dataset. Some other hospitals also showing a high volume in this dataset are Memorial Sloan Kettering, Cleveland Clinic, University of Michigan, Moffat, Johns Hopkins and Barnes Jewish. The specialist map can be consulted for a fuller list of high-volume centers for cholangiocarcinoma.
It is possible that other data sources might show somewhat different results depending on what exactly is being counted.
Here is the link for the specialist map:
Specialist Map
Regards, Mary