<prompt> Mirizzi syndrome is:GB stone compressing common hepatic ductGB carcinoma invading IVCGB stone causing cholecystitisPancreatic carcinoma  <response>: Ans. a GB stone compressing common hepatic ductCSENDES CLASSIFICATION of Mirizzi Syndrome -5 types. Type 1: Only compression of Common Duct. Type 2: Erosion less than 13rd Type 3: Erosion more than 13rd Type 4: Total destruction Type 5: Associated Cholecysto Enteric Fistula 