Figure 1.
PET/CT scan performed in a female patient (74 years old) with a pulmonary tumor of indeterminant character.
Incidental focal 18FDG uptake revealed in the left lobe of the thyroid gland (SUVmax 1.5). Colloid nodule in post-FNAB cytological evaluation.
Figure 2.
PET/CT scan of female patient (65 years old) with suspicion of colonic adenocarcinoma reoccurrence.
Incidental focal 18FDG uptake revealed in the right lobe of thyroid gland (SUVmax 7.1). Malignancy in post-FNAB cytological assessment, further confirmed in histopathological evaluation (papillary thyroid carcinoma).
Figure 3.
Diagram showing the protocol of the study and results of succeeding diagnostic steps.
Table 1.
Comparison between parameters estimated in PET/CT of benign and malignant nodules.
Figure 4.
Graph showing sensitivity and specificity for particular SUVmax (standardized uptake value) thresholds in the prediction of malignant thyroid lesions.
Figure 5.
Receiver operating characteristic (ROC) curve showing the correlation between standardized uptake value (SUVmax), sensitivity and specificity in the prediction of malignant thyroid lesions.
Cut off value – 3.3.
Table 2.
Sensitivity, specificity and positive predictive values of selected SUVmax thresholds for malignant lesions.