Biliary tubage, is interesting in the aetiological research of acute p
ancreatitis, when the origin is unknown after anamnesis, clinical exam
ination, abdominal ultrasonographic studies and retrograde cholangiogr
aphy. The sludge is the aetiology fond in 40% of the cases. Microscopi
c crystals are either cholesterol monohydrate, either calcium bilirubi
nate, or calcium carbonate microspheroliths. Biliary microscopic cryst
als drive the patients to the cholecystectomy to prevent acute pancrea
titis relapses.