Patients who have been diagnosed with gallbladder cancer only after cholecystectomy for benign lesions such as gallbladder stones and intraoperative or postoperative pathological examination are called “accidental gallbladder cancer”. For patients with accidental gallbladder cancer, if the pathological examination reveals carcinoma in situ (Tis) and stage T1a, as long as the surgical margins are negative and the gallbladder is not damaged during the operation, there is no need to operate again. However, patients with T2 and T3 stages need to undergo reoperation, including partial resection of the liver, segmental resection of the liver or even hemihepatectomy combined with lymphatic dissection. Gallbladder cancer lacks effective and sensitive chemotherapy drugs and reasonable chemotherapy regimens, but gallbladder cancer has some sensitivity to radiotherapy. For patients with advanced gallbladder cancer or after radical resection, local radiotherapy can be prescribed to prevent and reduce local recurrence.