Table 5. Detection of tumour vascularity by contrast-enhanced ultrasound according to tumour depth.

Arterial phase of dynamic CT	Depth (cm)	Early vascular phase of CEUS
		Hyper		Iso		Total	p-value
High density	≤9	79	(95%)	4	(5%)	83	0.0007
	>9	9	(60%)	6	(40%)	15
Isodensity	≤9	4	(44%)	5	(56%)	9	NE
	>9	1	(25%)	3	(75%)	4
Low density	≤9	2	(33%)	4	(67%)	6	NE
	>9	0		1	(100%)	1

Hyper, hyperenhancement; iso, iso-enhancement; CEUS, contrast-enhanced ultrasound; NE, not evaluated owing to insufficient numbers.