ENT doctors will make use of a variety of tests to find and diagnose sinus cancer. The tests will also help them identify if cancer has spread to other parts of the body. The tests will help doctors decide on the treatment that works best and prevents the rapid spread of cancer cells. When the ENT doctor has to diagnose a sinus problem, they will make use of a CT scan. This scan will help the doctor identify any abnormalities in the sinus cavities; this will also help identify if the growth within the sinus cavity is cancerous or benign. The most common age for sinus cancer diagnosis is 50s and 60s. Smoking and tobacco are significant causes of sinus and mouth cancer.