Benign Aspirates on Follow-Up FNA May Be Enough in Patients with Initial Atypia of Undetermined Significance/Follicular Lesion of Undetermined Significance

Table 2

Ultrasound features of 114 lesions.

US features	Standard reference		𝑃 value
	Benign (𝑛=110)	Malignancy (𝑛=4)
Composition			0.412
Solid	97 (88.2%)	3 (75.0%)
Mixed, solid < 50%	5 (4.5%)	0
Mixed, solid > 50%	8 (7.3%)	1 (25.0%)
Echogenicity			0.472
Hyperechogenicity	2 (1.8%)	0
Isoechogenicity	44 (40.0%)	3 (75.0%)
Hypoechogenicity	59 (53.6%)	1 (25.0%)
Markedly; hypoechogenicity	5 (4.5%)	0
Margin			>0.999
Well-defined	66 (60.0%)	3 (75.0%)
Microlobulated	37 (33.6%)	1 (25.0%)
Irregular	7 (6.4%)	0
Calcifications			0.562
Microcalcifications	11 (10.0%)	1 (25.0%)
Macrocalcifications	9 (8.2%)	0
No calcification	90 (81.8%)	3 (75.0%)
Shape			0.436
Wider than tall	96 (87.3%)	3 (75.0%)
Taller than wide	14 (12.7 %)	1 (25.0%)
Vascularity			>0.999
Peripheral	38 (34.5%)	2 (50.0%)
Central	1 (0.9%)	0
Both peripheral; and central	39 (35.5%)	1 (25.0%)
No vascularity	32 (29.1%)	1 (25.0%)
US assessment			0.625
Without suspicious; US features	70 (63.6%)	2 (50.0%)
With one or more; suspicious US features	40 (36.4%)	2 (50.0%)