[Nasal-sinusal inverted papillomas].

The authors report on 19 cases of Inverted Papilloma collected over ten years at the Institut Gustave-Roussy. The Inverted Papillomas are rare tumors affecting predominantly adult males. This slow progressing tumor is usually revealed by unilateral nasal obstruction (68%). Its loco-regional extension is best appreciated by radiologic and tomodensitometric scanning. After limited surgical resection, the tumor may either recur (11 out of 19 cases) or show malignant evolution (9 out of 19 cases). Histopathologic criterias of this latter possibility are discussed. A radical surgical treatment such as paralateronasal rhinotomy may prevent the malignant transformation of this benign tumor.