All are true about CBD stones except
Choledocholithiasis CBD stones are classified by point of origin Found in 6-12% of patients with GB stones Retained stones discovered within 2 years of cholecystectomy Recurrent stones detected >2 years following cholecystectomy Ref : Sabiston 20th edition Pgno :1494
Associated with GB stones
Primary stones are usually brown
Laboratory values may be normal in one third cases of choledocholithiasis
Retained stones are discovered after 2 years of cholecystectomy
G.I.T