The lungs.
Pulmonary refers to something dealing with the lungs.
The root in the word "pulmonary" is "pulmo," which comes from the Latin word for "lung."
pneum or pulmon
A ruptured pulmonary artery is a serious problem
Pulmonary-- Refers to the lungs and the breathing system and function.
Pulmonary
The word you are seeking is pulmonary.
Perfusio pulmonare
I guess you refer to the pulmonary valve stenosis which usually is due to the valve calcification when less blood supply will go from right ventricle of heart to the pulmonary circulation. The right ventricle will be hypertrophied because it's working harder then before.
"Pulmonary" is a fancy word meaning "lungs", therefore pulmonary circulation is just the route that blood takes between the heart and lungs, and vice versa.
Pulmonary is the word meaning related to lungs
The first one is primary because it's stressed.