Category:Forestomach - Inflammatory Pathology

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Granulomatous Inflammation

Traumatic Reticulitis

Mucormycosis

  • Mucor, a fungi, invades the rumen wall, e.g. after damage caused by rumenal acidosis.
  • Produces chronic ongoing granulomatous rumenitis.
  • Difficult to diagnose in life.
  • May produce pain and poor growth
  • Infective process may penetrate wall and produce peritonitis.

Pathology

Gross
  • Thickening and ulceration of mucosal surface of rumen.
    • Feels like thick leather.
  • Rumen wall becomes fibrosed.
Histological
  • Classical granulomatous inflammation
    • May have giant cells in addition to sheets of macrophages.
  • Can visualise fungal hyphae in tissue using special stains (PAS),
    • Often grow along blood vessels.
      • May cause thrombosis of small blood vessels, leading to further necrosis (infarction) of rumen wall.

Neutrophilic Inflammation

Rumenitis

  • Opportunistic pathogens take advantage of acidotic lesions and other disturbances of rumen flora.
    • e.g. F. necrophorum, fungi
    • Infection with Mucor gives mucormycosis- chronic ongoing granulomatous rumenitis.
    • Also agents which cause lesions in other areas of tract e.g. BVDV, actinobacillosis.

Pathology

Gross
  • Multiple, dark red areas of swollen papillae, mainly in ventral sac and pillars.
Histological
  • Coagulative necrosis of papillae
  • Marked neutrophil infiltrate
  • Serofibrinous exudate
  • Thromboembolic spread to form areas of coagulative necrosis and abscesses in liver.

Pages in category "Forestomach - Inflammatory Pathology"

The following 3 pages are in this category, out of 3 total.