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

Go Back

Image: F30349

Pathology Image
  • SPECIES:
    • CANINE
  • SYSTEM:
    • RESPIRATORY
  • ORGAN:
    • LUNG
  • DIAGNOSIS:
    • FOCAL BULLA WITH PAIRED LUNG FLUKES
  • CAUSE:
    • PARAGONIMUS KELLICOTTI
  • CONTRIBUTOR:
    • WILLIAMS
  • INSTITUTION:
    • Armed Forces Institute of Pathology
  • GENPATH:
    • HELMINTH
  • COMMENTS:
    • Paragonimus sp. flukes are respiratory parasites of mammals which eat crayfish, the second interemediate host. (The first intermediate host is an acquatic snail.) Adult flukes are hermaphroditic, oval, red-brown, 5‑10 mm long and 4‑7 mm in diameter; present in pairs in cysts (raised, soft, dark brown, 1-3 cm in diameter) and occasionally in bronchi; lesions are most common in the caudal lobes especially the right lobe. Migrating metacercariae produce pleural hemorrhages and foci of eosinophilic and fibrinous pleuritis, which heal as small umbilicated scars. Rupture of bullae containing flukes may result in pneumothorax. Granulomatous and eosinophilic pneumonia or granulomas that surround adults and eggs;hemosiderin laden macrophages .Adults have a spiny tegument, ventral sucker, loose parenchyma (lack a body cavity), paired ceca with dark pigment, vitellaria containing eosinophilic globular yolk material, gonads of both sexes