Table 5. Case distribution of all LN cases in Roswell Park Cancer Institute and Pittsburgh Medical Center with the reason of MRI and corresponding rate of upgrade.
| RPCI (n = 26) | Upgrade n (%) | UPMC (n = 29) | Upgrade n (%) | P-value | |
|---|---|---|---|---|---|
| BIRAD 3 | 1 (4) | 0 (0) | 5 (17) | 1 (20) | 0.014a |
| Staging | 17 (65) | 5 (29) | 8 (28) | 3 (38) | — |
| High risk | 8 (31) | 2 (25) | 16 (55) | 4 (25) | — |
| Mass | 9 (35) | 0 (0) | 12 (41) | 3 (25) | NSb |
| Non-mass | 17 (65) | 7 (41) | 17 (59) | 5 (29) | — |
Abbreviations: LN, lobular neoplasia; MRI, magnetic resonance imaging; NS, not significant.
a
P-value is for the difference in the reason of MRI: BIRAD 3, staging vs high risk between Roswell Park Cancer Institute and Pittsburgh Medical Center.
b
P-value is for the difference in the reason for upgrade between Roswell Park Cancer Institute and Pittsburgh Medical Center in terms of MRI type of enhancement (mass vs non-mass).