Perspectives a century later on the "Ansa en Y" of César Roux.

During the last 100 years, since César Roux began utilizing his "Ansa-en-Y" procedure for gastric outlet obstruction, the procedure at first fell into disuse but was later adapted for other applications. This article discusses the background of the procedure and compares the original indications with the author's current experience. Current applications in this series were for chronic pancreatitis (26 patients), alkaline gastritis (22 patients), biliary duct obstruction (7 patients), pancreatic pseudocyst (3 patients), and gastric substitution (3 patients).