Worried mom teenage son has anomalous right coronary artery

My son was recently diagnosed with having evidence of an anomalous right coronary artery coursing between the aorta and pulmonary artery. The cardiologist explained that a right coronary artery appears to connect with the proximal main pulmonary artery. He also said that this can be fatal.  He was given an echocardiogram and a MRA/MRI.

The cardiologist said that my son will need a catheterization.  He also said that this condition is very rare and so they will not be able to deal with this problem so he recommended that I take him to the Boston Children's hospital after the catheterization.  I tried looking on the internet for information about but I was not able to find anything.  The doctor did tell me that I will not find anything about it because it is so rare.

The results also showed that my son also has:

heart click
mild mitral regurgitation
Systolic Murmur: Grade 2/6 systolic ejection murmur along the left sternal border to apex
1st Heart Sound : Single
2nd Heart Sound: Normally split.

1.  Could someone please explain these problems to me in layman's term.  
2.  Please  tell me the chances of him dying from this?
3   Please tell me if there are treatments available for this conditon.
4  Do you think a catheterization is absouloutely necessary.  I am extremely scared and worried.  Please give me some advise.

Thanks in advance.
Sheila