Pulmonic Stenosis in a Bulldog

Pulmonic Stenosis in a Bulldog

History: The dog was diagnosed with pulmonic stenosis by the cardiologist.

Gross lesions:  The right ventricular myocardium was severely thickened to about 7-10 times the normal width. The pulmonic outflow tract was markedly narrowed, and the pulmonary artery was dilated and had a very thin wall.

Heart: The right side of the heart is thickened to nearly the size of the left ventricular wall. The probe is going through the pulmonic outflow tract

Heart: The right ventricle, a wire is passing through the pulmonic valve into the pulmonary artery. The outflow tract is severely narrowed measuring about 2mm in diameter.

Heart: Viewed looking down onto the base of the heart. The probe is threading through a branch of a coronary artery that is encircling the pulmonic valve.


A common cause of pulmonic stenosis in English Bulldogs results from a single right coronary artery which gives off a branch which encircles the pulomary artery causing a constriction.  This is called a “circumpulmonary left coronary artery”.

Other causes of pulmonic stenosis in dogs is valvular stenosis, which is very common, and is caused by malformed pulmonic valves. The valve develops abnormally in utero and becomes dome shaped with a central perforation.  The valve is unable to open properly during systole and causes occlusion of the outflow tract.

Another cause of PS is subvalvular stenosis, which is caused by a ring of fibrous tissue below the pulmonic valve, which constricts the outflow tract.

Gross lesions of pulmonic stenosis include: Right ventricular hypertrophy, post-stenotic dilatation of the pulmonary artery.  Pulmonic stenosis is inherited in Beagles and suspected to be inherited in English Bulldogs, Bull Mastiffs, Chihuahuas, and terriers.

About Brian

Anatomic Pathologist, VetPath Services, Stone Ridge, NY- musculoskeletal, oral/dental, and sinonasal diseases www.vetpathservices.com
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