title: Stratification in the gallbladder during intravenous cholangiography.
abstract: The stratification (layering) phenomenon in the gallbladder is a source of errors in interpretation of intravenous cholangiography. It may mimic stones that do not exist or conceal stones that do. To avoid false-positive or false-negative interpretations, it is suggested that delayed films be taken at 4 hours in cases which demonstrate a layering phenomenon. By this time, a normal gallbladder will be homogeneously opacified and a diseased one will reveal its stones. Horizontal beam roentgenograms are mandatory for complete evaluation.
mesh_terms: D000328:Adult; D000368:Aged; D002758:Cholangiography; D002765:Cholecystography; D002769:Cholelithiasis / Q000000981:diagnostic imaging*; D003951:Diagnostic Errors; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors