Table 2.

Image features of near-occlusions detected and overlooked in routine practice. Single case of near-occlusion with full collapse mistaken for dissection/thrombosis excluded

	Near-occlusions			p
	Detected (n = 21)	Mistaken for conventional stenosis (n = 68)	Mistaken for occlusion (n = 14)
Stenosis diameter mm mean (SD)	0.7 (0.2)	0.7 (0.2)	0.6 (0.4)	0.31*
Distal ICA diameter mm mean (SD)	1.9 (0.9)	2.4 (1.0)	0.8 (1.2)	< 0.001*,†
Ipsilateral/contralateral distal ICA mean (SD)	0.48 (0.36)	0.53 (0.21)	0.18 (0.27)	< 0.001*,†
Ipsilateral distal ICA/ECA mean (SD)	0.59 (0.30)	0.82 (0.44)	0.50 (1.07)	0.06*
Without full collapse, n (%)	7 (12)	48 (84)	2 (4)	< 0.001#
With full collapse, n (%)	14 (30)	20 (43)	12 (26)

ECA, external carotid artery; ICA, internal carotid artery; SD, standard deviation

*One-way ANOVA

^†Post hoc: Only mistaken for occlusion group was separated from the two other groups at p < 0.05

^#2-sided χ² test