Abstract

INTRODUCTION

According to the 5th edition of Breast Imaging Reporting and Data System (BI-RADS) lexicon of the American College of Radiology (ACR), the features of non-mass enhancement (NME) lesions have been investigated in a small number of studies and the need for new studies on this area has been mentioned. In this study, we aimed to investigate the features of NME lesions of breast detected in Magnetic Resonance Imaging (MRI).

METHODS

All breast MRIs performed at the Ankara Oncology Training and Research Hospital between 2015 and 2017 were reviewed and evaluated retrospectively. During this period, 23 NME lesions were detected in the MRI and constituted the study group. Distribution and pattern of NME lesions, curve types, presence of diffusion restriction, and presence of cystic structure, presence of palpable mass on physical examination and biopsy results were evaluated.

RESULTS

The mean age of the patients was 43.86 ± 6.95 (34-62) years. According to the biopsy results, 12 lesions (52.2%) were benign and 5 (21.7%) were malignant. When the distribution pattern of NME lesions was examined, 10 (43.5%) were multiple regional and 13 (56.5%) were regional. It was observed that all of the malignant lesions showed a regional pattern. The most frequently detected dynamic curve type was perseverative pattern, type 1 (13, 56.5%) curve. Type 2 curve with plateau pattern was observed in 9 (39.1%) lesions. Four (17.4%) of the lesions were palpable.

DISCUSSION AND CONCLUSION

Multiple regional distribution was more frequent distribution type than regional distribution in our study. Regional distribution pattern was significantly more frequent in malignant lesions compared to benign lesions. Further research, especially multi-center studies on distribution pattern and internal enhancement pattern of NME lesions should be performed.