Charles Louis Davis and Samuel Wesley Thompson DVM Foundation

For the Advancement of Veterinary and Comparative Pathology

info@cldavis.org | Phone: 847-367-4359 | Fax: 847-247-1869

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Image: F28103

Pathology Image
  • SPECIES:
    • CHICKEN
  • SYSTEM:
    • HEMATOPOIETIC
  • ORGAN:
    • THYMUS
  • DIAGNOSIS:
    • THYMIC LYMPHOMA
  • CAUSE:
    • AVIAN RETROVIRUS
  • CONTRIBUTOR:
    • WILLIAMS
  • INSTITUTION:
    • Armed Forces Institute of Pathology
  • GENPATH:
    • VIRAL
  • COMMENTS:
    • While they do not have lymph nodes, birds do have a thymus (in their neck as seen here) which is the site of T-cell development, as well as a Bursa of Fabricius, the site of B-cell development. Avian leukosis virus often causes B-cell tumors in the hematolymphatic organs. On a practical basis, there is no wayto definitively establish whether avian retroviruses (lymphoid leukosis, reticuloendotheliosis), or avian herpesvirus-1 (Marek's disease) is the cause of this tumor on gross or histologic inspection. At best, it is a educated guess (but still a guess).