Nasal polyposis is one of the most common benign lesions of the paranasal sinuses. Although they are frequ-ently seen and easily recognised, they are still a world wide important problem in otorhinolaryngology due to liner indefinite ethiopathology and difficulty of treatment. In this study 284 nasal polyposis cases on whom endoscopie sinus surgery was per-formed between February 1991 and August 1996 with teh Messerklinger technique were evaluated. Patients were staged as 11 (3,9 %) stage-1; 54 (19,0 %) stage-2; 102 (35,9%) stage -3; 117 (41,2%) stage-4 and as can be seen the largest group was in stage-4. Of the 284 patients, 189 (66,5%) had an anatomic variation, 100 (35,2%) had allergy and/or asthma and/or ASA sensitivity (88 had allergy -31,0%-, 35 had asthma -12,3%-, 12 had ASA sensitivity -4,2%-), and 92 (32,4%) of the patients were previously operated on. Our average postoperative follow up was 30 months. Our general success rate was found to be 80,6% upon evaluating the subjective improvements in the patients' symptoms in the postoperative period. The major and minor complication rates in our series were, 1,1% and 22,5% respectively.