Table 2 Description of histological types of benign and malignant tumours and other lesions

Benign tumours (87.9%)

1 fibrous lipoma

1 cavernous haemangioma

1 cystic ameloblastoma

2 osteomas

Malignant tumours (9.8%)

9 sinonasal epidermoid carcinoma (6 undifferentiated)

5 enteric-type mucinous adenocarcinomas

2 diffuse large B-cell lymphoma

1 NK/T lymphoma, nasal type

1 cystic adenoid carcinoma

1 basal-cell carcinoma

1 carcinosarcoma

1 Esthesioneuroblastoma

1 metastasis of clear-cell renal tumour

Other lesions (2.3%)

1 Mucosal thickening

1 Hyperostosis

1 Organised haematoma

1 Non-necrotising granulomatosis (granulomatosis with polyangiitis (GPA))