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Abstract
Changes in cholecystography during the past decade include use of denser contrast mediums, variations in technics, and new methods of preparing the patient. Use of denser contrast mediums appears directly related to the more frequent roentgenologic diagnosis of polypoid lesions. Dihydroxy-phenylisatin was found effective in reducing obscuration by gas and fecal material. Cholangiography using intravenous injections of sodium iodipamide has been a widely used preoperative procedure. Tomography has increased the accuracy of the examination.