Table 2.

The ultrasonographic features of Bethesda category I nodules.

Feature	Benign	Malignant	P value
Nodule type			0.012
Solid	16	33
Cystic and solid	19	12
Echogenicity status			0.000
Hypoechogenecity	10	39
Hyperechogenecity or isoechoic	25	6
Nodular edge status			0.915
Irregular	12	21
Regular	13	24
Halo			0.000
Without halo	33	10
With halo	2	35
Nodular size			0.139
Larger than 10 mm	4	11
Smaller than 10 mm	31	34
Calcification			0.001
With calcification	18	38
Without calcification	17	7