The purpose of this study is to determine whether using the assistance of imaging during maxillary balloon sinusotomy improves treatment outcomes for individuals with chronic maxillary rhinosinusitis. Maxillary balloon sinusotomy is a minimally invasive procedure during which a small balloon is placed through the nose to dilate (widen) sinus openings. Participants will undergo maxillary balloon sinusotomy; one side of the nose will receive balloon sinusotomy with visualization and the other side will not have visualization. The side that does not receive visualization will use traditional landmarks to guide the procedure. The procedure will be recorded to evaluate the accuracy of the evaluation. Participants will be asked to return to the clinic for follow-up visits and asked to complete the Sino-Nasal Outcome Test to measure physical, functional, and emotional effects of rhinosinusitis.