Table 3.

PNS detection comparison between 3D LAVA_Flex and T1WI in T3 and T4 stage nasopharyngeal carcinoma.

Level		T1WI 3D LAVA_Flex		T1WI		Total	MB test
	Nerve			negative	positive		P-value
1	mandibular nerve		negative	35	0	35	0.016
			positive	6	10	16
		Total		41	10	51
1	maxillary nerve		negative	40	0	40	0.125
			positive	3	8	11
		Total		43	8	51
1	cavernous sinus (CN III–V)		negative	40	0	40	0.063
			positive	4	7	11
		Total		44	7	51
2	anterior CNs		negative	25	0	25	0.031
			positive	5	21	26
		Total		30	21	51
1	hypoglossal nerve		negative	37	0	37	0.016
			positive	10	4	14
		Total		47	4	51
1	jugular foramen (IX–XI nerves)		negative	44	0	44	0.001
			positive	6	1	7
		Total		50	1	51
1	carotid space (IX–XII, primary lesion and/or lymph nodes)		negative	25	0	25	0.001
			positive	21	5	26
		Total		46	5	51
2	posterior CNs		negative	37	0	37	0.001
			positive	10	4	14
		Total		47	4	51
3	individual level (all above)		negative	22	0	22	0.008
			positive	7	22	29
		Total		29	22	51

PNS, perineural spread; CN, cranial nerve; 3D LAVA_Flex, three-dimensional liver acquisition with volume acceleration-flexible; MB, McNemar Bowker.