Since the possibility of malignancy is high in equivocal lesions, such lesions were considered malignant for calculating the various test characteristics in this study. The age of patients ranged from 16 to 67 years (mean 41.2 years). A summary of results as compared to histology is given in Table 2. Table-3. It is evident that when used alone, FNAC had highest sensitivity, specificity and positive predictive value, zero false positive rate and minimal false negative rate. PE had a reasonable sensitivity, though lowest specificity and highest false positive rate. The combination of all four investigative modalities showed 100% sensitivity and Negative predictive value and zero false negative rate; however there was sharp decline in specificity, positive predictive value and accuracy rate, in addition, it had resulted in high false positive rate (71.4%). There was no equivocal result on FNAC in this study. The results indicate that FNAC alone was able to give a definitive diagnosis in most of cases where the mass was easily felt and well defined. It was unable to give a correct diagnosis in one lesion (False negative rate-2.4%) due to small size of lesion.
Summary of various test characteristics is shown in