Objective: To describe the magnetic resonance imaging features of axillary lymph nodes on 1.5 Tesla breast magnetic resonance imaging in women with invasive breast cancer.
Subjects and methods: A cross-sectional descriptive study included 227 women with 229 invasive breast cancers who underwent preoperative 1.5 Tesla breast magnetic resonance imaging and subsequent axillary lymph node histopathological evaluation at National Cancer Hospital, campus 3 between March 2024 and January 2025. Axillary lymph node characteristics were analyzed on magnetic resonance imaging and correlated with pathological findings.
Results: The prevalence of axillary lymph node metastasis was 29.3%. Metastatic lymph nodes demonstrated significantly larger short-axis and long-axis diameters, higher short-to-long axis ratios, and greater cortical thickness compared with non-metastatic nodes (p < 0.05). In addition, metastatic nodes more frequently exhibited irregular margins, loss of fatty hilum, and diffusion restriction on DWI/ADC sequences than non-metastatic nodes (p < 0.05).
Conclusion: Breast magnetic resonance imaging is a valuable tool for the preoperative assessment of axillary lymph node metastasis in patients with invasive breast cancer.