Table 1.
Tumour features of invasive lobular carcinoma (ILC) and invasive ductal carcinoma (IDC) on digital mammography (DM) and digital breast tomosynthesis (DBT)
| DM | DBT | |||
|---|---|---|---|---|
| Imaging features | ILC (n = 20) | IDC (n = 23) | ILC (n = 20) | IDC (n = 23) |
| Asymmetry | 12 (60) | 5 (22) | 7 (35) | 3 (13) |
| Mass | 4 (20) | 16 (70) | 8 (40; 8/20) | 18 (78) |
| Shape | ||||
| Round | 0 | 2 (13) | 0 | 1 (6) |
| Oval | 0 | 2 (13) | 0 | 1 (6) |
| Irregular | 4 (100) | 12 (75) | 8 (100, 8/8) | 16 (88) |
| Margins | ||||
| Circumscribed | 0 | 0 | 0 | 1 (6) |
| Microlobulated | 0 | 0 | 0 | 1 (6) |
| Masked | 0 | 0 | 0 | 0 |
| Indistinct | 0 | 8 (50) | 2 (25) | 8 (44) |
| Spiculated | 4 (100) | 8 (50) | 6 (75) | 8 (44) |
| Density | ||||
| Fatty | 0 | 0 | 0 | 0 |
| Not dense | 0 | 4 (25) | 5 (62) | 6 (33) |
| Dense | 4 (100) | 12 (75) | 3 (38) | 12 (67) |
| Distortion | 13 (65) | 10 (43) | 16 (80) | 12 (52) |
| Presence of calcifications | 3 (15) | 6 (26) | 3 (15) | 3 (13) |
| Associated features | 4 (20) | 3 (13) | 4 (20) | 3 (13) |
| Skin retraction | 0 | 1 (33) | 1 (25) | 0 |
| Skin thickening | 0 | 0 | 0 | 1 (33) |
| Nipple retraction | 4 (100) | 2 (67) | 3 (75) | 2 (67) |
Values are given as absolute numbers and percentages (in brackets).
It can be noted that distortion could be described as associated with a mass or asymmetry or as an isolated finding.