Table 2. Sonographic characteristics of pathologically confirmed parotid masses.

Parameter		Benign	Malignant	p-value
Shape	Ovoid	108	12	> 0.05
	Lobulated	23	2	> 0.05
	Irregular	40	4	> 0.05
Margin	Circumscribed	158	15	> 0.05
	Spiculated	2	1	> 0.05
	Ill defined	11	2	> 0.05
Echogenicity	Anechoic	16	0	> 0.05
	Hypoechoic	149	18	> 0.05
	Isoechoic	6	0	> 0.05
Echotexture	Homogeneous	15	3	> 0.05
	Heterogeneous	156	15	> 0.05
	Calcification	20	3	> 0.05
Vascularization	0	62	5	> 0.05
	+	75	7	> 0.05
	++	20	3	> 0.05
	+++	14	3	> 0.05

0, grade 1 vascularization of the parotid masses; +, grade 2 vascularization of the parotid masses; ++, grade 3 vascularization of the parotid masses; +++, grade 4 vascularization of the parotid masses.