Which statement describes the growth pattern of cholangiocarcinoma?

Which statement describes the growth pattern of cholangiocarcinoma?

• A. It diffusely thickens the bile duct without invasion
• B. It forms cystic lesions in ducts
• C. It shows focal thickening of the ductal wall with surrounding mass invasion into the liver
• D. It only occurs in the gallbladder

Answer: (C)

Cholangiocarcinoma tends to grow by infiltrating the duct wall and extending into the surrounding liver tissue, producing a focal thickening of the ductal wall that is associated with an invading mass into the liver. This pattern reflects its malignant behavior along the biliary tract with direct invasion into adjacent parenchyma, which is a key imaging clue. Diffuse ductal thickening without invasion would more likely reflect benign or inflammatory processes, cystic lesions in the ducts are not typical for cholangiocarcinoma, and it is not restricted to the gallbladder—cholangiocarcinoma arises in the bile ducts, not exclusively in the gallbladder.

Cholangiocarcinoma tends to grow by infiltrating the duct wall and extending into the surrounding liver tissue, producing a focal thickening of the ductal wall that is associated with an invading mass into the liver. This pattern reflects its malignant behavior along the biliary tract with direct invasion into adjacent parenchyma, which is a key imaging clue. Diffuse ductal thickening without invasion would more likely reflect benign or inflammatory processes, cystic lesions in the ducts are not typical for cholangiocarcinoma, and it is not restricted to the gallbladder—cholangiocarcinoma arises in the bile ducts, not exclusively in the gallbladder.