Coastal Ear, Nose and Throat, committed to provide the highest quality medical care and an exceptional patient experience. A balloon sinuplasty is a minimally invasive endoscopic procedure used to treat chronic sinusitis. Sinusitis is an inflammation of the lining within the paranasal sinuses. When you have frequent sinusitis, or the infection lasts three months or more, it could be chronic sinusitis. Symptoms of chronic sinusitis may be less severe than those of acute; however, untreated chronic sinusitis can cause damage to the sinuses and cheekbones that sometimes requires surgery to repair.