An enlarged gallbladder shape is one in which the diameter of the gallbladder exceeds the normal range, but it is not necessarily caused by disease; in some normal people, the gallbladder itself may exceed the normal range. The most common clinical cause of gallbladder enlargement is cholecystitis, and the most common cause of cholecystitis is gallbladder stones, when there is not only an increase in the shape of the gallbladder, but also a series of changes in the wall of the gallbladder. In the early stage, the gallbladder wall can be gross, and as the lesion progresses, it can be thickened and edematous, and even a double track sign can appear. In addition, gallbladder tumors can also cause an increase in the shape of the gallbladder, at which time realistic occupying lesions can appear in the bile duct. In case of obstruction of the common bile duct, the gallbladder can also be significantly enlarged due to obstruction of the downward flow of bile, which is mainly seen in common bile duct stones, bile duct cancer, cancer of the head of the pancreas, peri-potbelly cancer, etc. At this time, there is no obvious inflammatory manifestation of the gallbladder, but the bile in the gallbladder can be excessively concentrated and very viscous, and it can even appear black in color.