Table 2.
Association of tumor features and tumor invasion of pectoralis major muscle at surgical pathology
| Tumor feature | n (%) with invasion of the pectoralis major muscle at surgical pathology | p-value |
|---|---|---|
| MRI finding type abutting the muscle | ||
| Non-mass enhancement | 1/11 (9.1%) | p = 0.802 |
| Mass | 3/20 (15.0%) | |
| Spicule of a mass | 0/7 (0%) | |
| Deformed contour of pectoralis muscle | ||
| Tenting of the muscle | 1/8 (12.5%) | p = 0.099 |
| Mass effect on the muscle | 1/2 (50.0%) | |
| Both tenting and mass effect | 1/4 (25%) | |
| No deformation of the muscle contour | 1/24 (4.2%) | |
| Tumor type | ||
| IDC | 4/38 | n/a |
| ILC | 0/38 (0%) | |
| IMC | [td] | |
| Microinvasive IDC | 0/38 (0%) | |
| DCIS | 0/38 (0%) | |
DCIS, Ductalcarcinoma in situ; IDC, Invasive ductal carcinoma; ILC, invasive lobular carcinoma; IMC, Invasive mammary carcinoma with ductal and lobular features.