Answer to Pathology MCQ 146

The Correct option is E


Most gallstones are composed of precipitated cholesterol, which is supersaturated in the bile of most humans. Gallstones need not always be compromised of Cholesterol and may be composed of precipitated unconjugated bilirubin in a minority of cases.


Such gallstones are termed as pigmented gallstones as these are usually dark/black in colour. In addition there might be precipitation of Calcium, forming a complex with bilirubin to form insoluble calcium bilirubinate. These are generally radio-opaque and are among the only gallstones detected by an X-Ray.

Secondary infection may cause change in color of these pigmented stones to a Brown/chocolate color depending upon the amount of inflammation and hemolysis at the site.

Category: Pathology MCQs