Aim: Comparative study between diagnostic nasal endoscopy and computed tomographic scan paranasal sinuses. Methods: This prospective comparative study was carried out in the Department of ENT, Shri Shankaracharya Institute of Medical Sciences (SSIMS), Bhilai, India, for the period of 1 year, after taking the approval of the protocol review committee and institutional ethics committee. 100 patients who visited the ENT OPD, those suffering from at least two of the symptoms of chronic rhinosinusitis and not responding to 3 weeks of medical treatment were selected