Polypoid lesions of the gallbladder (PLG) consist of gallbladder polyps, gallbladder adenomas and adenomyosis of the gallbladder. Non-neoplastic polyps (cholesterol, inflammation) are usually small and have no risk of cancer. Gallbladder adenomas have a significant premalignant potential and increase with the size of the tumor, making them an important precancerous lesion. Gallbladder adenomyosis is a chronic proliferative disease characterized by hyperplasia of the gallbladder glands and smooth muscle. In the past, it was thought that gallbladder adenomyosis had no malignant potential, but recent clinical observations and pathological studies have shown that gallbladder adenomyosis is a precancerous lesion. In particular, segmental adenomyosis.