UCVM Online Pathology Collection

UCVM Online Pathology Collection

G-CP-005
CN: 14-561
Species: Equid, Horse

Specimen:
Cranial mesenteric artery
Shown:
Verminous arteritis with aneurysmal dilation caused by Strongylus vulgaris
Etiology:
Strongylus vulgaris
General Information:
- Up to 100% prevalence in horses
- Lesions most commonly found in the cranial mesenteric artery
- Can cause colic in horses
Lifestyle:
Horse ingests L3 larvae, which invade the small intestine, cecum and colon to molt into L4 larvae. L4 larvae penetrate arterioles to reach the cranial mesenteric artery and molt to L5 larvae after 3-4 months. L5 larvae return to the colon and cecum forming nodules, which release adults when ruptured.
Gross Lesions:
Lesions range from insignificant intimal tracks, to occlusive thrombotic lesions in the cranial mesenteric and ileocecocolic arteries

References:
Jubb, Palmer and Kennedy's Pathology of Domestic Animals

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