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Table 2 Conventional ultrasound characters of three types of parotid gland benign tumors

From: The diagnostic value of Superb Microvascular Imaging in identifying benign tumors of parotid gland

  PA BCA WT P value
Size (Maximum diameter, cm) 2.71 ± 1.15 2.22 ± 0.79 2.85 ± 0.81 0.07
Shape
 Regular 81 14 55 0.07
 Irregular 67 4 28  
Boundary
 Well-defined 134 16 77 0.797
 Ill-defined 14 2 6  
Internal echogenicity
 homogeneous 65 11 25 0.02
 Inhomogeneous 83 7 58  
Cystic area
 Yes 131 15 63 0.09
 No 17 3 20