Table 2 Baseline characteristics of patients and low-dose CT features of incidental thyroid nodules

Sex (men)

21 (38.1%)

Age (years)

58 (53–68)

≥ 60 years

26 (47.2%)

Low-dose CT features

Lesions

Focal

44 (80%)

Multiple

11 (20%)

Number of nodules

72

Location

Right

43 (59.7%)

Left

25 (34.7%)

Isthmus

4 (5.5%)

Longest diameter (mm)

9.1 (6.2–15.6)

≥10 mm

31 (43.1%)

AP/T ratio^†

1.1 (0.9–1.2)

AP/T ratio ≥ 1

51 (70.8%)

Mean attenuation value (HU)

54 (33–114)

Margin

Well- circumscribed

42 (58.3%)

Ill-defined

30 (41.7%)

Density

Hypodense

50 (69.4%)

Isodense

0 (0%)

Hyperdense

1 (1.3%)

Heterogenous

2 (2.7%)

Densely calcified

19 (26.3%)

Any calcifications

26 (36.1%)

Rimcalcification

4 (5.5%)

Punctate calcification

4 (5.5%)

Thyroid enlargement

11 (15.2%)