MR imaging of triple-negative breast cancer.

Little is known about the MR imaging features of triple-negative breast cancer (TNBC), but TNBC has a worse prognosis because it has no effective therapeutic targets, such as estrogen receptor for endocrine therapy and human epidermal growth factor receptor 2 (HER2) for anti-HER2 therapy. MR findings of a unifocal lesion, mass lesion type, smooth mass margin, rim heterogeneous enhancement, persistent enhancement pattern, and very high signal intensity on T2-weighted images are typical features of breast MR imaging associated with TNBC. Although TNBC can mimic a benign morphology, the early MR imaging recognition of TNBC could assist in both the pretreatment planning and the prognosis, as well as adding to our understanding of the biological behavior of TNBC.