Intranasal encephalocele masking as a nasal polyp in an adult patient.

Intranasal encephaloceles are rarely seen in adult patients. These lesions may be mistaken for nasal polyps. A 36-year-old woman died after the removal of an intranasal encephalocele during a routine polypectomy. The possibility of an intranasal encephalocele must be considered when examining adult patients with nasal polyps.