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Abstract: Introduction: The first report of antrochoanal polyp (ACP) was made by Killian in 1906, which defined the eponym of this disease. Antrochoanal polyp is characterized as a solitary polyp arising from the posterior wall membrane of the maxillary sinus and growing towards the choana and nasopharynx. The etiology of this disease remains obscure, and the incidence in adults with nasal polyps varies from 3 to 6%. The objective of this study is to present our experience in the diagnosis and treatment of these patients. Methodology: in a retrospective study of the past ten years, we reviewed 101 cases of ACP regarding the preoperative symptoms, trying to identify possible risk factors, and analyzing the postoperative evolution. All the patients were submitted to surgical procedure, 67 cases underwent a Caldwell-Luc approach and the remaining 34 cases underwent a endonasal endoscopic procedure. Results: In our study of 101 patients, 53,9% were male, while 46,5% were female. The age varied from 1 to 64, with an average of 21,6 years. Nasal obstruction was the most common symptom (93,1%), followed by rhinorrhoea (87,1%), headache (38,6%) and allergic symptoms (37,60%). Minor complications occurred in 6,9 % of the patients; the most frequent were synechia (4,0%) and infraorbital hypoesthesia (3,0%). Postoperative symptoms included rhinorrhoea (9,9%) and headache (7,9%). The rate of recurrence was 3,0%. Conclusion: ACP is a disease of uncertain etiology that affects mainly adolescents and young adults. Treatment consists of surgery and in our experience endonasal endoscopic approach provides excellent results with low morbidity.
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