question: I am from Chennai. My son, aged 22,  had a right cardiac phrenic surgery two years ago. Before surgery the doctors were under the impression that he had pulmonary sequestration. After biopsy the opinion differed on whether he had sarcoma or not. Some onco-physicians felt that his right side should be reexplored. But an oncol-surgeon friend suggested that there is no need for doing anything. He suggested a full body scan (PET-CT) after one year of the surgery. The scan report did not indicate any health problem. So the doctor suggested another scan after the second year. The second year was over in May. I have not yet taken him for a scan, as he has just started working after his M Sc in media science. For the last one week he has been having cough from time to time. I feel uncomfortable when I hear him coughing. What do you suggest?