It is the narrowing of branch pulmonary arteries either left or right branch or both.

How does it manifest and what is the treatment?

It presents as asymptomatic murmur, shortness of breath, occasionally cyanosis etc. In significant stenosis, treatment has to be done for relieving the stenosis. It has to be done mainly either by surgery or by putting stent in branch artery. Sometimes, balloon dilatation of branch vessel may be tried.