What is the normal diameter of the main pancreatic duct in the body of the pancreas?

What is the normal diameter of the main pancreatic duct in the body of the pancreas?

• A. <2 mm
• B. <3 mm
• C. <2 mm?
• D. 2-4 mm

Answer: (A)

The main idea here is that the pancreatic duct’s size varies by where you look in the gland, and in the body of the pancreas it stays very small. In a healthy state, the main pancreatic duct in the body is typically less than 2 mm in diameter. The head can be a bit larger—up to about 3 mm—so a 3 mm duct can be normal in the head, but not in the body. If the duct in the body measures more than 2 mm, especially approaching or exceeding 3 mm, that suggests dilation from obstruction or another pathology. So the best answer is a diameter under 2 mm for the body. Values that imply up to 3 mm or a range like 2–4 mm are not normal for the body and would raise concern for dilatation.

The main idea here is that the pancreatic duct’s size varies by where you look in the gland, and in the body of the pancreas it stays very small. In a healthy state, the main pancreatic duct in the body is typically less than 2 mm in diameter. The head can be a bit larger—up to about 3 mm—so a 3 mm duct can be normal in the head, but not in the body. If the duct in the body measures more than 2 mm, especially approaching or exceeding 3 mm, that suggests dilation from obstruction or another pathology.

So the best answer is a diameter under 2 mm for the body. Values that imply up to 3 mm or a range like 2–4 mm are not normal for the body and would raise concern for dilatation.