Abstract: Objective To classify the different shapes of the cystic duct using magnetic resonance cholangiopancreatography (MRCP) imaging and analyze the correlation with the incidence of different biliary stones. Methods Patients who underwent MRCP in our hospital from January 2023 to December 2023 due to gallstones were selected. The morphology of the cystic duct was observed through imaging, and it was classified into four types based on the degree of curvature and number of angles formed. The length of the cystic duct and the height of its confluence were recorded. Results By analyzing and summarizing the morphology of the cystic duct and the incidence of biliary stones in 362 patients with MRCP, a total of 79 cases were classified as type 1; 132 cases of type 2; 71 cases of type 3; 80 cases of type 4. The correlation coefficient between the morphology of the cystic duct and the complexity of the stone site is 0.580 (P<0.0001); The duration of the disease is positively correlated with the morphology of the cystic duct, with a correlation coefficient of 0.207 (P<0.0001); The length of the cystic duct is positively correlated with its morphology, with a correlation coefficient of 0.507 (P<0.0001). Previous acute attacks [OR=9.625, 95% CI (4.966, 18.655), P<0.0001], abdominal tenderness upon admission, concomitant cystic duct stone entrapment , duration of attacks, cystic duct length are all independent risk factors for complex cystic duct morphology. Conclusion The gallbladder and cystic duct exhibit diverse morphological variation in patients with bile duct stones. MRCP can accurately display the current anatomical variations of the cystic duct and has good diagnostic value for biliary diseases.

Key words: Gallbladder duct morphology, MRCP, Cholecystolithiasis