[Frontal cerebral abscess, a rare complication of nasosinusal polyposis. Apropos of a case].

Sinusonasal polyposis is frequent but usually benign. A 77-year-old woman with an history of sinusonasal polyps, presented with fever and neurologic impairment. Radiologic imaging showed a polypoïd mass filling the nose and sinuses, eroding the ethmoïd bone, progressing intracranially, and causing brain abscess. The literature is reviewed, according to the relations between brain abscess development and nasal polyposis, with emphasis on intracranial extension of sinusonasal polyps. Treatment of the nasal polyps, usually based on the use of local or general corticosteroïds, can avoid this serious complication.