Fig. 4From: Efficacy of ultrasonography and Tc-99m MIBI SPECT/CT in preoperative localization of parathyroid adenomas causing primary hyperthyroidismReceiver-operating characteristics (ROC) curve analysis for the polar vascularity sign. When the maximum diameter of the nodule was 1.35 cm, the sensitivity and specificity of the residual parathyroid sign in predicting parathyroid adenoma were 79.0% and 55.6%, respectivelyBack to article page