Demographics and histology of benign and malignant sinonasal lesionsa
| Parameters | Benign Lesions (n = 56) | Malignant Lesions (n = 75) |
|---|---|---|
| Mean age (yr) | 43.86 ± 14.11 | 52.27 ± 15.21 |
| Sex (female/male) | 24:32 | 24:51 |
| Histologic subtypes | Inflammatory polyps (28) | Squamous cell carcinoma (23) |
| Inverted papilloma (14) | Olfactory neuroblastoma (13) | |
| Fibroangioma (5) | Malignant melanoma (12) | |
| Spindle cell tumor (4) | Rhabdomyosarcoma (9) | |
| Schwannoma (2) | Lymphoma (6) | |
| Ossifying fibroma (2) | Adenoid cystic carcinoma (5) | |
| Enamel cell tumor (1) | Undifferentiated carcinoma (2) | |
| Osteosarcoma (2) | ||
| Neuroendocrine carcinoma (2) | ||
| Malignant fibrohistiocytoma (1) |
↵a Data in parentheses indicate the number of corresponding patients. All inverted papillomas did not have the potential for association with/conversion to squamous cell carcinoma, proven by histopathology.