Before my husband, David, was diagnosed with a rare cancer of the nasal cavity called sinonasal undifferentiated carcinoma (SNUC), he had a sinus infection, congestion, and sinus pain and pressure. He thought it was allergies, but when the symptoms did not go away with antibiotics and steroids, he had a CT scan. The ENT suggested that David have surgery to remove the polyp blocking the entrance to his sinus cavity.

On...