Antrochoanal polyp: analysis of 200 cases.

Antrochoanal polyp was described by Professor Gustav Killian, in 1906, giving a specificity among polyposis; it represents 4-6% of all nasal polyps and displays both analogies and differences with bilateral nasal polyposis. Antrochoanal polyp is a benign lesion originating from the mucosa of the maxillary sinus, growing through the accessory ostium into the middle meatus and, thereafter, protruding posteriorly to the choana and nasopharynx. Incomplete excision of antrochoanal polyp almost always leads to recurrence. The Authors, therefore, provocatively question? Whether the antrochoanal polyp is a benign tumour or not? The Authors analyse the largest series of antrochoanal polyps present in the literature and report on a series of 200 patients treated consecutively at the ENT Clinic at the University of Florence, Italy. Clinical-aetiological data related to these 200 patients, treated between January 1988 and April 2006, have been analysed. Evaluation of the data presents some analogies and some disagreement with results from other series. In conclusion, based on the data obtained, it is tempting to suggest that the antrochoanal polyp develops from an increase in pressure in the Highmoro antrum due to a phlogistic-anatomical alteration at ostio-meatal complex/middle meatus level, in patients with a pre-existing silent antral cyst, subsequently forced to herniation outside, through the accessory ostium.