Abstract Background The clinical diagnosis and treatment of dilation of the cholangiopancreatic duct in patients with ambiguous ampullary disease. termed unexplained dilation of the cholangiopancreatic duct (UDCD). is commonly difficult. This study aimed to evaluate the applicability of transduodenal ampullectomy (TDA) for the diagnosis and treatment of UDCD. https://fitnessgravesyardes.shop/product-category/on-off-switch/