My 10 year old son was born with transposition of the great arteries and had corrective surgery at 3 months old. He has had no significant problems other than valves leaking moderately since but sees his cardiologist every year. We are watching for signs of 3 leaking valves to worsen. I noticed last night that his left chest area is significantly larger than the right side, to the point his ribs are showing through at the center of his chest on left but not right. It has not been this way in the past. Is this cause to take him back to the cardiologist earlier than his next appt in 4 months?