TG and cholangiocarcinoma: Other topics in this specific area that refer to the hormonal insights in CCAs (which remain out of the scope of the present work) might include thyroid hormones’ implications in the liver and biliary duct tract under physiological and pathological circumstances (such as goitre or thyroid cancer) or the analysis of the CCA subgroups that displays adrenal metastases complicated with adrenal insufficiency [177,178,179].