Gallstones are like tiny rocks that form in the gallbladder. They are made of cholesterol or bile particles that clump into a solid mass. A stone can grow as liver bile passes through the gallbladder. Most gallstones are small enough to pass out of the body through the intestines without our noticing. However, some do get caught in the narrow outlet of the gallbladder or in the intestines. This can lead to pain, a buildup of bile, pancreatitis and/or infection.Above: MRI of a stone in the pancreatic duct.
Below: MR images showing stones in the pancreas.