Fig. 1. Illustration of method of measurement of MTV 2.5 (A), MTV 3.0 (B), MTV 3.5 (C), and MTV 4.0 (D) of thyroid ¹⁸F-FDG incidentaloma by ¹⁸F-FDG PET/CT.

MTV 2.5, MTV 3.0, MTV 3.5, and MTV 4.0 were 2.07, 1.49, 1.00, and 0.83 cm3, respectively. MTV = metabolic tumor volume, PET/CT = positron emission tomography/computed tomography, SUV = standardized uptake value, ¹⁸F-FDG = fluorine-18-fluorodeoxyglucose