**5. Conclusions**

Due to the possibility of assessing vascularity, CESM is characterized by high sensitivity in the assessment of CR after NAC. The use of morphological assessment alone is insufficient. CESM correlates well with the sizes of residual lesions from histopathological examination but tends to underestimate the dimensions.

**Author Contributions:** Conceptualization, A.G. and K.S.-R.; methodology, A.G., K.S.-R., and A.B.-G.; software, K.S.-R. and A.L.; validation, A.L., K.S., and K.S.-R.; formal analysis, A.L., A.B., P.N., and K.S.-R.; investigation, A.L., A.B., K.S.-R., and A.B.-G.; writing—original draft preparation, A.L., K.S.-R., A.G., K.O., Z.L., and I.M.; writing—review and editing, K.S., P.N., A.L., K.S.-R., and A.G.; design of the manuscript, A.G., P.N., K.S.-R., and A.L.; translation, J.P.; supervision, I.G. and K.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Due to the retrospective nature of this study, the local ethics committee of the Medical University of Silesia repealed the requirement for informed consent (decision number PCN/0022/KB/157/20). All the test procedures were carried out in compliance with the ethical principles of the 1964 Helsinki Declaration and its subsequent amendments.

**Informed Consent Statement:** Not applicable. **Data Availability Statement:** Data are available upon special request.

**Conflicts of Interest:** The authors declare no conflict of interest.
