Table 1. Age distribution and traditional US characteristics of DCIS (n=66) and DCISM (n=23).
| Characteristic | DCIS, n (%) | DCISM, n (%) | χ2 | P |
|---|---|---|---|---|
| Age | 3.497 | 0.06 | ||
| <45 years | 32 (48.5) | 6 (26.1) | ||
| ≥45 years | 34 (51.5) | 17 (73.9) | ||
| Tumor size | 5.026 | 0.03 | ||
| <2.5 cm | 46 (69.7) | 10 (43.5) | ||
| ≥2.5 cm | 20 (30.3) | 13 (56.5) | ||
| Shape | 3.379 | 0.07 | ||
| Mass | 48 (72.7) | 21 (91.3) | ||
| Non-mass abnormality | 18 (27.3) | 2 (8.7) | ||
| Orientation | - | 0.57 | ||
| Parallel | 62 (93.9) | 23 (100.0) | ||
| Not parallel | 4 (6.1) | 0 (0.0) | ||
| Echogenicity | 0.476 | 0.89 | ||
| Hypoechoic | 41 (62.1) | 14 (60.9) | ||
| Isoechoic | 2 (3.0) | 0 (0.0) | ||
| Hyperechoic | 0 (0.0) | 0 (0.0) | ||
| Complex cystic and solid | 23 (34.8) | 9 (39.1) | ||
| Margin | 4.279 | 0.04 | ||
| Circumscribed | 20 (30.3) | 2 (8.7) | ||
| Not circumscribed | 46 (69.7) | 21 (91.3) | ||
| Vascularity | 0.022 | 0.88 | ||
| Present | 39 (59.1) | 14 (60.9) | ||
| Absent | 27 (40.9) | 9 (39.1) | ||
| Ductal extension | 1.293 | 0.26 | ||
| Present | 15 (22.7) | 8 (34.8) | ||
| Absent | 51 (77.3) | 15 (65.2) | ||
| Calcifications | 5.152 | 0.02 | ||
| Present | 25 (37.9) | 15 (65.2) | ||
| Absent | 41 (62.1) | 8 (34.8) |
US, ultrasound; DCIS, ductal carcinoma in situ; DCISM, ductal carcinoma in situ with microinvasion.