Value of CT in diagnosis of SPNs (n = 36) Surgery Sum Malignant Benign CT Malignant 17 2 19 Benign 1 16 17 Sum 18 18 36 Sensitivity 94.4%%, specificity 88.9%, positive predictive value 89.5%, negative predictive value 94.1%, accuracy 91.7% 3.3.5.