Sonography of the bile ducts after a fatty meal: an aid in detection of obstruction.
Simeone JF, Mueller PR, Ferrucci JT, vanSonnenberg E, Hall DA, Wittenberg J, Neff CC, O'Connell RC. Sonography of the bile ducts after a fatty meal: an aid in detection of obstruction. Radiology. 1982 Apr; 143(1):211-5.