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IN recent years, surgeons who operate upon patients for biliary-tract disease have become increasingly aware of the significant role of obstruction of the common duct at the sphincter of Oddi.

In 1949 Trommald and Seabrook, 1 of Portland, Oregon, called attention to benign stenosis of the lower end of the common duct as a pathologic lesion associated with gallstones and common-duct ...