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Updated: Dec 31, 2025

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Multicystic peritoneal tumor in two layer hens.

Keiko Yoshida1, Tomoyuki Miyoshi2, Tomoaki Murakami2

  • 1Fukuoka Prefecture Meat Safety Inspection Center, 4-5-34 Futsukaichi Chuo, Chikushino-shi, Fukuoka 818-0072, Japan.

The Journal of Veterinary Medical Science
|January 15, 2020
PubMed
Summary

This study details unique peritoneal cystic tumors in two chickens, identified as multicystic mesothelioma with Mullerian characteristics. This finding provides crucial insights into rare avian neoplasms.

Keywords:
chickenelectron microscopyimmunohistochemistrymesotheliomaperitoneal cyst

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Area of Science:

  • Veterinary Pathology
  • Avian Neoplasia
  • Comparative Oncology

Background:

  • Peritoneal cystic lesions in chickens lack clear categorization.
  • Understanding rare avian tumors is crucial for poultry health.

Observation:

  • Diffuse peritoneal multiple cysts were observed in two layer hens.
  • Cysts were lined by squamous or cuboidal cells, with papillary proliferations in one case.
  • Smooth muscle layers surrounded the cysts, and lining cells expressed cytokeratin, vimentin, S100, and WT1.

Findings:

  • Histological and immunohistochemical analysis suggested multicystic mesothelioma with Mullerian epithelial features.
  • Ultrastructural examination revealed sparse luminal microvilli on cyst lining cells.
  • This is the first detailed pathological description of this unique chicken tumor.

Implications:

  • This report expands the understanding of rare peritoneal tumors in chickens.
  • It provides a basis for future diagnostic and research efforts in avian oncology.
  • Highlights the importance of detailed pathological characterization for novel disease entities.