Table 1.

Comparison of contrast-enhanced ultrasound (CEUS) image characteristics between benign and metastatic lymph nodes in NPC patients.

Characteristics of CEUS image	Metastatic lymph nodes of NPC(n = 80)	Benign lymph nodes(n = 64)	P-value
Lesion's enhancement order			0.000
Centrifugal perfusion	6 (7.50%)	62 (96.88%)
Centripetal perfusion	74 (92.50%)	2 (3.12%)
Internal lesion's homogeneity			0.000
Homogeneous enhancement	16 (20.00%)	60 (93.75%)
Inhomogeneous enhancement	64 (80.00%)	4 (6.25%)
Enhancement degree			0.001
Hyper-enhancement	78 (97.50%)	52 (81.25%)
Hypo-enhancement	2 (2.50%)	12 (18.75%)
No enhancement	0	0
Presence of perfusion defects			0.000
Yes	30 (37.50%)	0
No	50 (62.50%)	64 (100%)
Ring high enhancement of surrounding area			0.503
Yes	2 (2.50%)	0
No	78 (97.50%)	64 (100%)