Table 1. Ultrasonographic findings in benign and malignant breast lesions in patients with nipple discharge.

Variable	Pathology No. (%)		p-value
	Benign (n=59)	Malignant (n=8)
Age (yr)*	46.8±11.3	52.5±16.6	0.456
Size (cm)*	1.1±4.2	1.4±8.7	0.377
Distance from the nipple (cm)†	1.0 (0.0–6.0)	1.0 (0.0–7.0)	0.568
Tissue composition			0.497
Homogeneous fat	2 (66.7)	1 (33.3)
Homogeneous fibroglandular	28 (90.3)	3 (9.7)
Heterogeneous	29 (87.9)	4 (12.1)
Shape			0.030
Oval	40 (95.2)	2 (4.8)
Round	9 (75.0)	3 (25.0)
Irregular	10 (76.8)	3 (23.1)
Orientation			0.029
Parallel	51 (97.7)	4 (7.3)
Not parallel	8 (66.7)	4 (33.3)
Margin			0.278
Circumscribed	21 (95.5)	1 (4.5)
Indistinct	6 (75.0)	2 (25.0)
Angular	1 (100.0)	0
Microlobulated	29 (87.9)	4 (12.1)
Spiculated	2 (66.7)	1 (33.3)
Echogenicity			0.609
Hypoechoic	18 (90.0)	2 (10.0)
Isoechoic	32 (84.2)	6 (15.8)
Mixed (solid and cystic)	8 (100.0)	0
Heterogeneous	1 (100.0)	0
Posterior features			0.444
None	43 (87.8)	6 (12.2)
Enhancement	14 (93.3)	1 (6.7)
Shadowing	2 (66.7)	1 (33.3)
Calcification			1.000
None	56 (87.5)	8 (12.5)
Microcalcification in mass	3 (100.0)	0
Association with ducts			0.751
Single mass not associated with duct	34 (85.0)‡	6 (15.0)‡
Mass incompletely filling the duct	7 (100.0)	0
Mass completely filling the duct or extending outside the duct	18 (90.0)	2 (10.0)
Adjacent ductal dilatation			0.465
No	27 (84.4)	5 (15.6)
Yes	32 (91.4)	3 (8.6)
Branch duct			0.554
0	45 (88.2)	6 (11.8)
1	12 (92.3)	1 (7.7)
2 or more	2 (66.7)	1 (33.3)

^*Mean±SD; ^†Median (range); ^‡Seven among 34 benign lesions (20.6%) and one among six malignant lesions (16.7%) showed adjacent ductal changes.