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A 37-year-old patient with HR-negative and HER2-positive non-mass-like lesion (invasive ductal cancer). The maximum intensity projection (MIP) images of pretreatment, F/U-1, and final MRI are shown. MRI shows a complete response and the pathology shows pCR. Although this is a non-mass lesion, the diagnosis of MRI in HR-negative and HER2-positive tumor that receives trastuzumab is highly accurate. This is a true negative case.
