Balloon Sinuplasty (BSP) is a minimally invasive procedure that provides long term relief from chronic sinusitis symptoms. Sinusitis refers to the inflammation of the lining of the sinus and is often preceded by a cold or allergic attack. Sinuses are hollow air filled spaces in the skull, found between the eyes (ethmoid sinus), the forehead (frontal sinus), nose (sphenoid sinus) and cheek bones (maxillary sinus). The sinuses are lined with mucus secreting cells. The mucus traps germs and pollutants in the sinuses and drains through the sinus opening into the nasal cavity. This keeps the sinuses clean and healthy.