Table 3.

Neck metastasis and occult metastasis according to histology.

	Histological Type	pT1-T2 Node Metastasis/Cases	pT3-T4 Node Metastasis/Cases	All Node Metastasis/Cases
Low risk	Acinic cell carcinoma	0/13	2/3 (66.6%)	2/16 (12.5%)
	Mucoepidermoid carcinoma (low grade)	0/10	0/2	0/12
	Carcinoma ex pleomorphic adenoma	0/6	1/2 (50%)	1/2 (50%)
	Oncocytic carcinoma	1/1 (100%)	1/2 (50%)	2/3 (66.6%)
	Myoepithelial carcinoma	0/1	0/3	0/4
	Secretory carcinoma	0/3	-	0/3
	TOTAL LOW RISK	1/34 (2.9%) *	4/12 (33%) *	5/46 (10.9%) *
High risk	Adenocarcinoma	1/1 (100%)	0/1	1/8 (12.5%)
	Mucoepidermoid carcinoma (high grade)	-	0/1	0/1
	Primitive squamous cell carcinoma	1/2 (50%)	0/1	1/3 (33.3%)
	Adenoid cystic carcinoma	0/2	1/6 (16.6%)	1/8 (12.5%)
	Salivary duct carcinoma	1/2 (50%)	-	1/2 (50%)
	High-grade carcinoma NOS a	0/1	1/1 (100%)	1/2 (50%)
	Undifferentiated carcinoma	1/1 (100%)	-	1/1 (100%)
	TOTAL HIGH RISK	4/9 (44.4%)	2/10 (20%)	6/19 (31.6%) *

^a NOS: not otherwise specified. * p < 0.05.