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Related Experiment Videos

Floating gallstones in bile without added contrast material.

H C Yeh, J Goodman, J G Rabinowitz

    AJR. American Journal of Roentgenology
    |January 1, 1986
    PubMed
    Summary

    Floating gallstones can occur naturally due to concentrated bile, not just contrast agents. These gallstones may float after fasting and sink after eating, indicating varying specific gravity.

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    Area of Science:

    • Gastroenterology
    • Medical Imaging
    • Biliary System Pathophysiology

    Background:

    • Floating gallstones are typically associated with contrast material increasing bile's specific gravity.
    • The phenomenon of spontaneous floating gallstones is less commonly reported.
    • Understanding the factors influencing gallstone buoyancy is crucial for accurate diagnosis.

    Purpose of the Study:

    • To investigate the occurrence and characteristics of floating gallstones without contrast administration.
    • To identify the underlying reasons for spontaneous gallstone buoyancy.
    • To define sonographic criteria for demonstrating floating gallstones.

    Main Methods:

    • Observation of three patients with floating gallstones over 17 months.
    • Analysis of gallstone behavior (floating/sinking) in relation to fasting and food intake.
    • Review of sonographic findings and criteria for floating gallstone detection.

    Main Results:

    • Floating gallstones were observed in three patients without contrast material.
    • Gallstone buoyancy was linked to the specific gravity of inspissated bile after fasting.
    • Gallstones demonstrated varying specific gravity, causing some to float while others sank.

    Conclusions:

    • Floating gallstones can occur spontaneously due to high specific gravity of inspissated bile after fasting.
    • Gallstone buoyancy is dynamic and influenced by bile concentration and composition.
    • Specific sonographic criteria are necessary for accurate identification of floating gallstones.

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