“…A number of different suggestions have been made, but there is no reason to insist on a single cause for all cases. Those described by Lee and Englender (1953), Greenstein and Wesson (1954), and Codington and Platt (1958) in which there was complete or almost complete atresia of the cystic duct with signs of chronic inflammation suggest previous acute cholecystitis with fibrosis. In one of the cases described by Williams there was a hypoplastic biliary tract and the atresia of the cystic duct here seems to be due to a congenital malformation, possibly complicated by infection.…”