Pulmonary aneurysm killed Steeplechase winner, preliminary report finds

The pulmonary aneurysm that killed Iroquois Steeplechase winner Arcadius was unpreventable and impossible to detect in pre-race veterinary checks, equine experts said Monday.

Arcadius collapsed after winning the 71st running of the Iroquois on Saturday at Percy Warner Park. According to a preliminary necropsy released Monday, the horse’s pulmonary artery ruptured just above the heart.

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November 2025
Nov 27 2025
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Two Rank Mares race this Thursday, Nov. 20 has been canceled out of precaution due to the current EVH-1 outbreak. We hope to be back for our next scheduled race, Dec 4th. Thank you.

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