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MR images of a 41-year-old female with luminal B (human epidermal growth factor receptor 2-negative) type invasive ductal carcinoma in the right breast. The malignant mass is demonstrated in (a) a contrast-enhanced T1 weighted image and (b) a diffusion-weighted image (b = 800 s mm−2). (c) The signal intensity of the tumour decays quickly at low b-values. (d) The signal intensity decay of the normal tissue is relatively flat at low b-values.
