Inverted papilloma with recurrence and malignant transformation
Seven of 44 patients (16%) had tumour recurrence throughout the study period. This group of patients were classified as IP with recurrence. Three patients (6.8%) were found to have synchronous SCC and were classified as IP with SCC). The remaining 34 patients (77.2%) with benign lesions and without recurrence were grouped as IP (Table 1).