Combined x-ray diffraction and microchemical gallstone analysis in determining the sequential events in biliary...

Area of Science:

• Biochemistry
• Mineralogy
• Pathology

Background:

• Gallstones are common biliary calculi.
• Understanding gallstone composition is crucial for diagnosis and treatment.

Purpose of the Study:

• To analyze the detailed composition of gallstones.
• To investigate the role of protein and crystalline components in gallstone formation.
• To elucidate the process of biliary lithogenesis.

Main Methods:

• Layer-by-layer analysis of 75 gallstones.
• X-ray diffraction for crystalline structure identification.
• Microchemical techniques for elemental and molecular composition.

Main Results:

• Protein detected in 96% of gallstone nuclei.
• Predominant crystalline components identified as cholesterol polymorphs and calcium carbonate forms.
• Distinct compositional differences observed between cholesterol and mixed calculi.
• Epitaxy suggested as a significant factor in post-nidus calculus growth.

Conclusions:

• Multiphasic analytical techniques are valuable for gallstone characterization.
• Protein presence in nuclei initiates gallstone formation.
• Crystalline composition and epitaxy play key roles in the development of mixed gallstones.