Table 1.

2022 5th edition of the World Health Organization (WHO) Classification of Tumours of the nasal cavity, paranasal sinuses, and skull base

Diagnostic Group	Category	Diagnostic Entity Section
Hamartomas		Respiratory epithelial adenomatoid hamartoma Seromucinous hamartoma Nasal chondromesenchymal hamartoma
Respiratory epithelial lesions
	Sinonasal papillomas	Sinonasal papilloma, inverted type Sinonasal papilloma, oncocytic type Sinonasal papilloma, exophytic type
	Carcinomas	Keratinizing squamous cell carcinoma Non-keratinizing squamous cell carcinoma NUT carcinoma SWI/SNF complex-deficient sinonasal carcinoma Sinonasal lymphoepithelial carcinoma Sinonasal undifferentiated carcinoma Teratocarcinosarcoma HPV-related multiphenotypic sinonasal carcinoma
	Adenocarcinoma	Intestinal-type adenocarcinoma of the sinonasal tract Non-intestinal-type sinonasal adenocarcinoma
Mesenchymal tumors of sinonasal tract		Sinonasal tract angiofibroma Sinonasal glomangiopericytoma Biphenotypic sinonasal sarcoma Chordoma
Other tumors		Sinonasal ameloblastoma Adamantinomatous craniopharyngioma Meningioma of sinonasal tract Olfactory neuroblastoma