Regarding biliary (gallstone) stones, the following statements are TRUE:

• A. False: CBD stones cause cholangitis.
• B. False: Stones can form de novo in bile ducts.
• C. False: Transient obstruction causes biliary colic.
• D. False: Only about 10% of gallstones are radio-opaque (the majority are radiolucent); it is renal stones that are around 90% radio-opaque.
• E. True

Facts about gallstones

Gallstones cause a range of biliary problems.

Key facts

• Risk factor for gallbladder carcinoma.
• CBD stones cause acute cholangitis.
• Stones can form de novo in the bile ducts (brown pigment stones).
• Transient cystic duct obstruction causes biliary colic.
• Form from supersaturation of bile.

The error

• Only about 10% (not 90%) of gallstones are radio-opaque.

Statement-by-statement verdict

Why A is false

CBD stones DO cause acute cholangitis.

Why B is false

Stones CAN form de novo within the bile ducts (brown pigment stones).

Why C is false

Transient cystic duct obstruction DOES cause biliary colic.

Why D is false

Only about 10%, not 90%, of gallstones are radio-opaque.

Why E is true

Gallstones increase gallbladder carcinoma risk.