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Related Experiment Videos

Hepatic amyloidosis: morphologic differences between systemic AL and AA types.

F S Buck1, M N Koss

  • 1Department of Pathology, Los Angeles County-University of Southern California Medical Center, University of Southern California School of Medicine 90033.

Human Pathology
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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Topographic distribution of amyloid in the liver is unreliable for classifying amyloidosis types. Specific staining methods are essential for accurate diagnosis of primary (AL) and secondary (AA) amyloidosis.

Area of Science:

  • Pathology
  • Hepatology
  • Immunohistochemistry

Background:

  • Systemic amyloidosis frequently involves the liver.
  • Distinct topographic patterns of amyloid deposition in the liver lobule have been described.
  • The reliability of these patterns for differentiating amyloid types (AL vs. AA) is debated.

Purpose of the Study:

  • To evaluate the reliability of topographic distribution patterns of amyloid in the liver for distinguishing between primary (AL) and secondary (AA) amyloidosis.
  • To compare the distribution of AL and AA amyloid within the liver lobule.

Main Methods:

  • Autopsy examination of 286 livers from patients with systemic amyloidosis.
  • Classification of amyloid type using potassium permanganate Congo red staining and a specific anti-AA antiserum.

Related Experiment Videos

  • Analysis of topographic distribution patterns (vascular, sinusoidal) within the liver lobule and correlation with spleen findings ('sago' pattern).

    • Main Results:

    • Both AL and AA amyloid involved portal vessels.
    • Amyloid deposition occurred frequently in portal stroma, central veins, and sinusoidal areas for both types.
    • A sinusoidal pattern was observed in 29 of 78 secondary (AA) amyloidosis cases, with significant sinusoidal replacement in 14.
    • A 'sago' spleen pattern was noted in 23 of these AA cases but lacked consistent association with specific inflammatory diseases.

    Conclusions:

    • Topographic distribution of amyloid within the liver lobule is not a reliable method for distinguishing AA from AL amyloidosis.
    • Specific staining techniques are crucial for accurate diagnosis and guiding therapeutic decisions in systemic amyloidosis.