Receiver operating characteristic analysis for quantitative variables revealed that the best cut-off values to differentiate mucinous cystoadenomas (MCAs) from mucinous cystoadenocarcinomas (MCACs) were: 7 cm for the size of the lesion [Youden index 0.5624, area under the curve (AUC) = 0.799, p < 0.0001] (a); 3 mm for thickness of septa (Youden index 0.7696, AUC = 0.919, p < 0.0001) (b); 3 mm for thickness of the wall (Youden index 0.6321, AUC = 0.845, p < 0.0001) (c); and 4 for the number of loculations (Youden index 0.5867, AUC = 0.872, p < 0.0001) (d).