Prediction of Extrathyroidal Extension Using Ultrasonography and Computed Tomography

Table 2

Diagnostic accuracy of preoperative US and CT to predict the extrathyroidal extension.

	Group	Cutoff criteria	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	AUC (95% CIs)
US	Group 1
		Contact with capsule	93.2	18.6	61.1	66.7	0.532 (0.415–0.666)
	Group 2
		Disruption of capsule	66.1	65.1	72.2	58.3	0.647 (0.452–0.702)
	Group 3
CT	Group A
		Contact with capsule	86.8	30.2	52.4	72.2	0.483 (0.382–0.519)
	Group B
		More than 25% contact	71.1	44.2	48.2	67.7	0.448 (0.335–0.491)
	Group C
		More than 50% contact	23.7	95.4	81.8	58.6	0.638 (0.571–0.719)
	Group D

US, ultrasonography; CT, computed tomography; PPV, positive predictive value; NPV, negative predictive value; CIs, confidence intervals.