Table III.
MRI characteristics of pure breast IMPC.
| Features | n (%) |
|---|---|
| Mass-like enhancement | 4 |
| Shape | |
| Oval | 1 (25) |
| Irregular shape | 3 (75) |
| Edge | |
| Clear | 1 (25) |
| Irregular | 2 (50) |
| Burr | 1 (25) |
| Internal enhancement feature | |
| Uniform | 1 (25) |
| Inhomogeneous | 2 (50) |
| Edge enhancement | 1 (25) |
| Non-mass enhancement | 4 |
| Distribution | |
| Linear | 1 (25) |
| Focal | 2 (50) |
| Regional | 1 (25) |
| Internal enhancement feature | |
| Uniform | 2 (50) |
| Inhomogeneous | 1 (25) |
| Cluster-like | 1 (25) |
| TIC | 8 |
| Early stage | |
| Slow | 1 (12.5) |
| Medium | 1 (12.5) |
| Fast | 6 (75) |
| Delay stage | |
| Outflow type | 8 (100) |
| Axillary lymph node metastasis | 6 |
| (+) on MRI | 3 (50) |
| (−) on MRI | 3 (50) |
| Metastatic lymph nodes detected by MRI | 8 |
| Sensitivity | 50% |
| Specificity | 100% |
| Positive predictive value | 100% |
| Negative predictive value | 40% |
| Overall accuracy | 62.5% |
| Invasion of the nipple, chest wall or skin | 2 (25) |
MRI, magnetic resonance imaging; IMPC, invasive micropapillary carcinoma; TIC, time-intensity curve.