Bouveret's syndrome: appearance on CT and upper gastrointestinal radiography before and after stone obturation.
Singh AK, Shirkhoda A, Lal N, Sagar P. Bouveret's syndrome: appearance on CT and upper gastrointestinal radiography before and after stone obturation. AJR Am J Roentgenol. 2003 Sep; 181(3):828-30.