**1. Introduction**

Sinusitis is swelling or an inflammation of the tissue lining of the sinuses. Sinuses are hollow cavities anatomically located within the cheekbone, around the eyes and behind the nose. Physiologically sinuses are filled with air and contain mucous which helps in moisten, warm and filter the inhaled air. Pathophysiologically, when the sinuses get blocked by the mucous, viruses and bacteria can grow and cause infection in sinuses [1].
