Dr. Lukas Steffen knows the answer
The operation on the mother of two children was actually supposed to be a purely routine matter. The removal of the gallbladder due to gallstones is one of the most common procedures at the Diospi Suyana Hospital. This time, however, the general surgeon had to remove 21 gray stones from the choledochus. The concretions in the gallbladder were yellow. The latter are probably cholesterol stones. The darker grays are called pigment stones. They form directly in the bile duct if the bile acids contain too much bilirubin.
