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Liver capsule thickening characterized by mesothelial cell proliferation with vascularization in broilers ascites

A Sakumi1, R Yamaguchi, J Tottori

  • 1Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki, Japan.

Avian Pathology : Journal of the W.V.P.A
|March 1, 1996
PubMed

Insights

Ascites syndrome in broiler chickens causes liver capsule thickening due to mesothelial cell proliferation. This pathological change, involving spindle-shaped cells and fluid-filled cysts, is specific to the liver capsule.

Area of Science:

  • Veterinary Pathology
  • Avian Medicine
  • Poultry Science

Background:

  • Ascites syndrome is a significant economic problem in broiler chickens.
  • Pathological changes in broiler ascites often involve the liver and serosal membranes.
  • Understanding the specific mechanisms of liver capsule thickening is crucial for disease management.

Purpose of the Study:

  • To pathologically examine thickened liver serosal membranes in broiler chickens with ascites syndrome.
  • To characterize the cellular and structural changes associated with liver capsule thickening.
  • To differentiate liver capsule changes from those in other serosal membranes.

Main Methods:

  • Gross pathological examination of 24 broiler chickens with ascites.
  • Histopathological analysis of liver capsules and other serosal membranes.
  • Immunohistochemical staining using anti-keratin and anti-vimentin antibodies.

Main Results:

  • All 24 cases showed liver capsule thickening and focal hepatitis.
  • Thickened liver capsules comprised spindle-shaped cells, confirmed as mesothelial cells via keratin and vimentin expression.
  • Fluid-filled cysts were observed within the thickened capsules, likely due to sub-capsular fluid accumulation.
  • These specific changes were unique to the liver capsule, not observed in air sacs or pericardium.

Conclusions:

  • Liver capsule thickening in broiler ascites syndrome is characterized by mesothelial cell proliferation.
  • The proliferation results in cyst formation and is associated with vascularization.
  • These findings highlight a specific pathological response of the liver serosa in this condition.

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