NAVLE® Question of the day

A six-year-old Friesian stallion presents for several days of a deep cough, lethargy, mild colic signs, and swelling of the forelimbs and chest. Last week he travelled several hours to breed a mare.

Physical examination reveals jugular pulsations and a loud continuous machinery cardiac murmur. Thoracic auscultation identifies bilaterally increased bronchovesicular sounds.

What is the top differential?

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