The Bethesda System for Reporting Thyroid Cytopathology: A Cytohistological Study

Table 1

Distribution of cases according to the Bethesda system.

Bethesda category	Bethesda category percentage (%)	FNA diagnosis	No. of cases (total = 646)	Percentage (%)
I—nondiagnostic (89)	13.8	Cyst fluid	6	0.9
		Scant cellularity	50	7.8
		Obscuring blood	33	5.1
II—benign (490)	75.9	Nodular goitre	224	34.7
		Adenomatoid nodule	37	5.7
		Colloid nodule	70	10.8
		Grave’s disease	3	0.5
		Lymphocytic (Hashimoto) thyroiditis	156	24.2
III—AUS/FLUS (8)	1.2	AUS/FLUS	8	1.2
IV—FN/SFN (24)	3.7	FN/SFN	24	3.7
V—suspicious for malignancy (17)	2.6	Suspicious for papillary carcinoma	16	2.4
		Suspicious for medullary carcinoma	1	0.2
VI—malignant (18)	2.8	Papillary carcinoma	13	2.0
		Medullary carcinoma	3	0.4
		Poorly differentiated carcinoma	1	0.2
		Undifferentiated carcinoma	1	0.2