These conditions are very rare. They are more common congenitally than from causes occurring during life. They are difficult of diagnosis, usually remaining undiscovered until revealed by autopsy. If either condition is thought to exist there are so many symptoms present that would suggest other valvular conditions that a diagnosis is uncertain. Pulmonary stenosis is the most common of the two and it occurs from other disease. It follows inflammation of the structure or lining of the heart, as well as atheroma; also other valvular disease and especially ulcerative endocarditis.
The Eclectic Practice of Medicine with especial reference to the Treatment of Disease, 1910, was written by Finley Ellingwood, M.D.