My son (age 15) just had a physical and a heart mumur - he had a electrocardiogram and found patent foramen ovale - should he have surgery to close?

Depends: A patent formen ovale is usually asymptomatic and does not require treatment, however, the issue needs to be assessed by a cardiologist to ensure that there is no other cardiac anomaly. See this site for more information. http://www.ncbi.nlm.nih.gov/pubmedhealth/pmh0002102/.

Not necessarily: Even if he is extremely healthy, go see a pediatric cardiologist. They will do a 2d echocardiogram which will answer your questions.