Bethesda System for Reporting Thyroid Cytopathology: A three-year study at a tertiary care referral center in Saudi Arabia

Table 1 The Bethesda system

Diagnostic category	Cytological diagnosis	Risk of malignancy, %	Usual management
I	Nondiagnostic or unsatisfactory	1-4	Repeat FNA with ultrasound guidance
II	Benign	0-3	Clinical follow-up
III	AUS/FLUS	5-15	Repeat FNA
IV	FNS/SFN	15-30	Surgical lobectomy
V	Suspicious for malignancy	60-75	Near-total thyroidectomy or surgical
VI	Malignant	97-99	Near-total thyroidectomy

FNA: Fine-needle aspiration; AUS/FLUS: Atypia of undetermined significance or follicular lesion of undetermined significance; FNS/SFN: Follicular neoplasm or suspicious for follicular neoplasm.