Table 1.

Correlation between the BI-RADS classification (Breast Imaging Reporting and Data System) and the histology for the corresponding imaging method

	BI-RADS classification	Isolated DCIS	IDC-DCIS	Isolated-IDC	Isolated ILC	Other tumours	Total
Diagnostic imaging		N (%)	N (%)	N (%)	N (%)	N (%)	N (%)
Sonography	0	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	1	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	2	0 (0%)	0 (0%)	0 (%)	0 (0%)	1 (11.1%)	1 (0.8%)
	3	0 (0%)	0 (0%)	3 (7.3%)	0 (0%)	0 (0%)	3 (2.5%)
	4	10 (66.7%)	17 (44.8%)	10 (24.4%)	8 (44.4%)	5 (55.6%)	50 (41.3%)
	5	5 (33.3%)	20 (52.6%)	28 (68.3%)	10 (55.6%)	3 (33.3%)	66 (54.5%)
	6	0 (0%)	1 (2.6%)	0 (0%)	0 (0%)	0 (0%)	1 (0.8%)
Mammography	0	0 (0%)	1 (2.6%)	0 (0%)	1 (5.6%)	0 (0%)	2 (1.7%)
	1	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	2	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	3	1 (6.7%)	4 (10.5%)	3 (7.3%)	0 (0%)	1 (11.1%)	9 (7.4%)
	4	1 (6.7%)	12 (31.6%)	17 (41.5%)	11 (61.1%)	5 (55.6%)	46 (38.0%)
	5	13 (86.6%)	19 (50%)	17 (41.5)	6 (33.3%)	3 (33.3%)	58 (47.9%)
	6	0 (0%)	2 (5.3%)	4 (9.7%)	0 (0%)	0 (0%)	6 (5.0%)
MRI	0	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	1	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	2	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
	3	0 (0%)	0 (0%)	0 (0%)	0 (%)	0 (0%)	0 (0%)
	4	0 (0%)	2 (5.3%)	4 (9.8%)	0 (0%)	0 (0%)	7 (5.8%)
	5	9 (60%)	22 (57.9%)	26 (63.4%)	8 (44.4%)	3 (33.3%)	68 (56.2%)
	6	6 (40%)	14 (36.8%)	11 (26.8%)	9 (50%)	6 (66.7%)	46 (38.0%)

DCIS Ductal carcinoma in situ, IDC Invasive ductal carcinoma, ILC Invasive lobular carcinoma.