Table 2 Clinical and US characteristics of patients with benign and malignant parotid tumors (n=115).
| Features | Benign (n=72) | Malignant (n=43) | P-value |
| Age (year) | 57.5±15.2 | 58.7±19.2 | 0.716 |
|
Sex
Male Female |
39 33 |
22 21 |
0.755 |
|
Number of lesions
Single Multiple |
57 15 |
41 2 |
0.018 |
| Maximum diameter (mm) | 26.81±9.07 | 35.03±13.04 | <0.001 |
|
Shape
Regular Lobulated Irregular |
41 22 9 |
3 7 33 |
<0.001 |
|
Margin
Well-defined Poorly defined |
64 8 |
13 30 |
<0.001 |
|
Echogenicity
Hypoechoic Hyper-/isoechoic |
72 0 |
43 0 |
Not available |
|
Echotexture
Homogeneous Heterogeneous |
34 38 |
11 32 |
0.021 |
| Calcification (yes/no) | 3/69 | 15/28 | <0.001 |
| Cystic areas (yes/no) | 18/54 | 11/32 | 0.945 |
|
Blood flow grade
0-I II-III |
24 48 |
10 33 |
0.252 |