Of 115 proved cases of inverted papilloma, 81 were studied radiologically. The tumor was seen in both early and late stages. Many cases presented as recurrent tumor after multiple surgical procedures. A common radiologic presentation was a unilateral mass in the nasal fossa with opacification of the contiguous maxillary sinus in a moderately advanced tumor stage. However, other radiologic patterns were encountered and it was therefore impossible to categorize any of these findings as specific for inverted papilloma.