what is the maxillary sinus
The maxillary sinuses are the largest of the paranasal sinuses. These are located within the areas of the upper jaws, below the eye sockets and behind the cheekbone. The drainage of the mucus from the maxillary sinus is through an opening called the ostium. Any obstruction to the mucus flow from the maxillary sinuses may cause a sinus infection. Amongst the other sinuses, maxillary sinus infection is most common.