Abstract
The pathology of aortic-iliac thrombosis(AIT) in two adult Thoroughbred horses from the same breeding farm is reported. No. 1 showed sudden falls with moaning and profuse sweating at mating and during hard exercise repeatedly for more than two years. The symptoms subsided within several tens of minutes. No. 2 showed intermittent lameness of the left hind leg progressively for more than three years. In both horses, thromboembolism was observed in the abdominal aorta, terminal quadrifurcation, and branchial arteries bilaterally. Arterial intima without adherent thrombi had formed intimal plaques frequently. Other noticeable changes were parasitic aneurysm and Hemomelasma ilei. From these findings of the two cases it is suggested that AIT is one of the pathological conditions caused by Strongylus vulgaris infection.
