It is so good to hear this. My husband was 51 when diagnosed with SNUC of maxillary sinus. He did not need to have surgery, but had 39 IMRT and 3 round of chemo with 5FU and Cisplatin. Terrible side effects from the chemo and radiation-mouth sores, nausea, weight loss, bilateral pulmonary emboli, had feeding tube after 50# weight loss, vision problems with (R) eye, etc.
But he just had his 18 month PET scan and no cancer seen. The doctor actually told us that "I don't think you realize how lucky you are." Most people don't survive this"
You need to be aggressive. He was treated for 2 months for a "sinus infection" before he was finally diagnosed with SNUC. He kept saying, something is wrong-this is not a sinus infection-finally had a CT scan and the tumor was seen.
Best wishes for continued good health for your son.
Kathy