Results: Survey of 300 patients with sinusitis disease manifestations in Ear Nose & Throat departerment of Cho Ray hospitals in HCM City with obtained results: average age of 41, focusing much aged 35 - 49 (40%); female (59.3%) and men (40.7%); functional symptoms are nasal obstruction, and pain space on the relationship with accessory ostium of maxillary; there are 34 patients with accessory maxillary ostium (11.3%), the location in the antorior nasal Fontanelle was 67.6%, the posterior nasal Fontanelle was 32.4%, a circle shape is 44.2%, oval shape is 55.8%, of which 24 patients with chronic rhinosinusitis percentage was 70.6% and that there is a correlation between accessory maxillary ostium condition with chronic rhinosinusitis.