Diagnostic Accuracy of the Bethesda System for Reporting Thyroid Cytopathology (TBSRTC): An Institution Experience

Table 4

Risk of malignancy for each Bethesda category.

Bethesda category	Institutional risk of malignancy (%) N = 855	Estimated risk of malignancy in TBSRTC (%) [8]	Risk of malignancy in Inabnet et al. (%) [17] N = 21,746	Risk of malignancy in Nayar and Ivanovic (%) [18] N = 5194	Risk of malignancy in Voung et al. (%) [19] N = 145,066
I	2.7–100	5–10	19.2	9	2.0–19.1
II	0	0–3	12.7	2	0.7–8.0
III	4.6–40	6–18	31.9	6	9.2–30.5
IV	15.4–20	10–40	31.4	14	28.9
V	61.1	45–60	77.8	53	79.6
VI	95–100	94–96	96.0	97	99.1