'Double duct' sign is diagnostic of
In pancreatic carcinoma(periampullary carcinoma) , the main pancreatic duct may be narrowed or completely obstructed at the site of the tumour, or the distal bile duct may be narrowed. Concurrent narrowing of both ducts results in the so called double duct signReference : page 1134 Bailey and Love's sho practice of surgery 25th edition
Periampullary carcinoma
Gallbladder carcinoma
Klatskin's carcinoma
Hepatocellular carcinoma
Urology