JPC SYSTEMIC PATHOLOGY
DIGESTIVE SYSTEM
October 2018
D-P15

Signalment (JPC #3048313):  A pigeon

HISTORY:  None

HISTOPATHOLOGIC DESCRIPTION:  Proventriculus:  Multifocally, compound tubular glands are markedly dilated, lined by attenuated epithelium and contain many cross sections of adult female nematodes, which compress adjacent atrophic glands (compression atrophy) and elevate the overlying mucosa. Nematodes are approximately 1.5 mm in diameter, have a 3 um cuticle and a pseudocoelom containing abundant homogenous brightly eosinophilic material; polymyarian/coelomyarian musculature; a digestive tract lined by many uninucleate cuboidal cells with a brush border containing abundant brown pigment; uteri containing numerous 25 x 50um, oval, thick shelled, embryonated eggs, and variably sized ovaries with ova. Occasionally, embryos within ova have visible polar filaments.  Multifocally within the lamina propria of the primary ducts are several small aggregates of lymphocytes and rare heterophils. There is increased mucous production in the superficial mucosa.

Heart; esophagus; ventriculus; great vessel; and lung:  Essentially normal tissue.

MORPHOLOGIC DIAGNOSIS:  Proventriculus, tubular glands and lumen:  Duct ectasia, multifocal, moderate, with compression atrophy and intraductal and intraluminal adult nematodes, etiology consistent with Tetrameres sp., pigeon (Columba livia), avian.

ETIOLOGIC DIAGNOSIS:  Proventricular tetrameriasis

CAUSE:  Tetrameres sp. (T. americana or T. fissispina)

GENERAL DISCUSSION:

PATHOGENESIS:

LIFE CYCLE:

TYPICAL CLINICAL FINDINGS:

TYPICAL GROSS FINDINGS:

TYPICAL LIGHT MICROSCOPIC FINDINGS:

ADDITIONAL DIAGNOSTIC TESTS:

DIFFERENTIAL DIAGNOSIS: 

For nematodes in proventriculus:

COMPARATIVE PATHOLOGY:

REFERENCES:

  1. Gardiner CH, Poynton SL. In: An atlas of metazoan parasites in animal tissues. Washington DC: Armed Forces Institute of Pathology; 1999:34.
  2. McDougald LR. In: Swayne DE, ed. Diseases of Poultry. 13th ed. Ames, IA: John Wiley & Sons; 2013:1131-1132.
  3. Schmidt GD, Roberts LS. In: Foundations of Parasitology. St. Louis, MO: Mosby; 1981: 501-511.
  4. Urquhart GM, Armour J, Duncan JL, Dunn AM, Jennings FW. In: Veterinary Parasitology. 2nd ed. Oxford, UK: Blackwell Science Limited; 1996:85.


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