Table 1. Reclassification of cases according to corresponding TBSRTC categories.

Bethesda category	Different classifications used in the local studies
I	Unsatisfactory, no thyroid follicular cells (C0); <6 groups of follicular cells (C1)
II	Absence of atypical cells (type I); malignant cells not present, benign (C2); atypical cytology but no evidence of malignancy (type II)
III	–
IV	Follicular aspirate, equivocal-hyperplastic nodule vs. follicular neoplasm (C3)
V	Suggestive of, but not conclusive for malignancy (type III); cytology strongly suggestive of malignancy (type IV); suspicious of malignancy (C4)
VI	Cytology conclusive for malignancy (type V); malignant (C5)

TBSRTC, the Bethesda System for Reporting Thyroid Cytopathology.