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).