Aparent asks the nurse, "the doctor said my baby has something called pulmonic stenosis. what does that mean? " what is the best response by the nurse?

Pulmonic stenosis is a dynamic or fixed obstruction of flow from the right ventricle of the heart to the pulmonary artery. 
The nurse would most likely say that it is a fixed or dynamic obstruction which means that your child's heart is not getting good blood flow through it artery to the heart.

Pulmonic stenosis, also known as pulmonary stenosis, is a dynamic or fixed obstruction of flow from the right ventricle of the heart to the pulmonary artery. It is usually first diagnosed in childhood.

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Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.