Pigment stone is composed of?: (A) Ca bilirubinate, (B) Ca phosphate, (C) Ca carbonate, (D) Ca gluconate
Answer is A. Ans. (a) Ca bilirubinate(Ref: Robbins 9th/pg 877)Two main types of gallstones:Cholesterol stones (most common type in West) containing crystalline cholesterol monohydrate.Pigment stones composed mainly of calcium bilirubinate; contain <20% cholesterol and are classified into "black" & "brown" types, the latter forming secondary to chronic biliary infection.