— In 33 patients undergoing nasal polypectomy, severely dysplastic or intraepithelial malignancy was observed focally in the surface Lining of these polyps. Follow-up on 29 of these patients showed that the changes did not recur or progress to invasive tumor, and that local excision was curative. Investigations as to the possible causation of such changes failed to provide any answers. Other hypotheses in relation to the pathogenesis and significance of these changes are put forward.
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