Table 2. Distributions of US diagnoses in each bethesda category.

Bethesda Category	No. of nodules	US probably benign		US malignant
	n = 622	n = 440 (70.7%)		n = 182 (29.3%)
		US benign	US indeterminate
		n = 285 (45.8%)	n = 155 (24.9%)
I	93 (15.0%)	54 (8.7%)	25 (4.0%)	14 (2.3%)
II	319 (51.3%)	214 (34.4%)	89 (14.3%)	16 (2.6%)
III	24 (3.9%)	6 (1.0%)	8 (1.3%)	10 (1.6%)
IV	35 (5.6%)	8 (1.3%)	25 (4.0%)	2 (0.3%)
V	20 (3.2%)	0	1 (0.1%)	19 (3.1%)
VI	131 (21.0%)	3 (0.5%)	7 (1.1%)	121 (19.5%)