they found a severe mucoperiosteal thickening in the left maxillary sinus, yet I have no runny nose, no plugged nose and I am being treated with Bactrim. the reason for the ct scan is I have been experiencing intense head aches at the back of my head. I am not seeing how this is related. the headaches are a daily event, one small seizure woke me up. I can not bend over with out my head pounding at the back top of my head, sneezing laughing or coughing also cause extreme pain in the same area.