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Hepatic echinococcal cysts: sonographic appearance and classification.

D B Lewall, S J McCorkell

    Radiology
    |June 1, 1985
    PubMed
    Summary
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    This study classifies hepatic echinococcal cysts based on ultrasound findings, revealing a natural progression from simple cysts to calcified lesions. This classification aids in understanding echinococcosis progression.

    Area of Science:

    • Radiology
    • Parasitology
    • Hepatology

    Background:

    • Echinococcal cysts of the liver are common parasitic infections.
    • Sonographic evaluation is crucial for diagnosing and monitoring liver echinococcosis.

    Purpose of the Study:

    • To propose a sonographic classification system for hepatic echinococcal lesions.
    • To correlate sonographic findings with the pathology and natural history of echinococcosis.

    Main Methods:

    • Retrospective analysis of sonographic images from 59 patients with hepatic echinococcal lesions.
    • Development of a classification system based on lesion morphology and content.

    Main Results:

    • A four-type classification (I, IR, II, III) was proposed, reflecting cyst complexity and stage.

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  • Type I: simple cysts; Type IR: ruptured cysts with membranes; Type II: cysts with daughter cysts/matrix; Type III: calcified lesions.
  • Natural progression observed from Type I to Type III, with daughter cyst formation as an aging process.
  • Infected cysts exhibit altered sonographic appearance (diffusely hyperechoic).

    • Conclusions:

    • The proposed sonographic classification effectively represents the pathology and natural history of hepatic echinococcosis.
    • Understanding cyst progression aids in diagnosis and management.
    • Sonography is a valuable tool for characterizing echinococcal liver disease.