Gallbladder polyp 11mm is likely to be cancerous. The incidence of gallbladder polyps is about 0.3% to 9.5%, divided into two categories of non-neoplastic polyps and neoplastic polyps, with benign lesions predominating. Tumor polyps account for about 5%, mainly originated from the tumorigenic proliferation of gallbladder mucosal epithelial cells, and the wide basal type or long-term gallbladder inflammation stimulation can induce cancer, with cancerous tendency. The malignancy of gallbladder cancer is extremely high, and the median survival period is about 1 year. The cancerous transformation of gallbladder polyps is as follows: 1. Non-neoplastic gallbladder polyps have minimal possibility of becoming cancerous, so it is important to review ultrasound and monitor the growth rate. 2. Tumorigenic gallbladder polyps, less than 10mm malignant rate of about 1%-5%, mostly asymptomatic, need to pay attention to close dynamic follow-up review, observation of polyp changes. 3. Tumorigenic gallbladder polyps more than 10mm, the rate of malignant transformation is about 50%-60%, even if asymptomatic, should consider surgical resection of the gallbladder to remove polyps. Gallbladder polyps must be followed up and re-examined on a regular basis to rule out the risk of cancer, and seek medical attention when abnormalities or symptoms are detected.