Prediction of Extrathyroidal Extension Using Ultrasonography and Computed Tomography

Table 3

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

Findings		Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	AUC (95% CIs)
US	CT
Contact with capsule	Contact with capsule	98.0	25.7	64.9	90.0	0.428 (0.352–0.574)
	More than 25% contact	87.8	48.6	70.5	73.9	0.472 (0.415–0.666)
	More than 50% contact	18.4	94.3	81.9	45.2	0.521 (0.483–0.637)
Disruption of capsule	Contact with capsule	97.6	40.7	71.9	91.7	0.654 (0.525–0.729)
	More than 25% contact	92.9	70.4	83.0	86.4	0.744 (0.646–0.802)
	More than 50% contact	59.5	92.6	92.7	59.5	0.725 (0.672–0.809)

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