Differential Diagnosis of Parotid Gland Tumors: Role of Shear Wave Elastography

Table 2

Summary of the predictive power of individual conventional US parameters as a benign/malignant classifier. Chi-square test (or Fisher’s exact test when more appropriate) values provided for each predictor.

US parameter	Benign	Malignant	value
Clearly delineated margin	93	6	<0.001
Blurred margin	3	22
Not lobular shape	77	23	0.82
Lobular shape	19	5
Heterogeneous echogenicity	39	19	0.01
Homogeneous echogenicity	57	9
Mainly anechogenic	17	3	0.22
Mainly hypoechogenic	78	24
Mainly isoechogenic	1	0
Mainly hyperechogenic	0	1
Absent calcifications	92	21	<0.001
Present calcifications	4	7
Present cystic part	43	14	0.63
Absent cystic part	53	14
Present septa in cystic part	11	1	0.10
Absent septa in cystic part	29	14
Unilateral condition	85	28	0.06
Bilateral condition	11	0
No vascularisation	32	5	0.01
1-2 vessels	23	9
Peripheral vascularisation	23	1
3 or more vessels	18	12
Cervical lymph nodes not enlarged	88	18	<0.001
Cervical lymph nodes enlarged	8	10