[Ultrasound morphology of gallstones].

Using a subtile examination technique genuine information can be obtained from the interior of a gallstone--at least to a depth of 15 mm. This information should provide an indication of the homogeneous (crystalline) or inhomogeneous (non-cholesterol) structure of the stone. Further systematic use of differentiating gallstone ultrasonography could become a useful additional decision making criterion for selection of gallstones suitable for conservative treatment.