Figure 4. A 53-year-old woman with invasive ductal carcinoma in the left breast and benign lymph node (LN) classified due to no fluorodeoxyglucose (FDG) uptake on positron emission tomography computed tomography (PET/CT). (A) Axial fat suppressed contrast enhanced T1-weighted image reveals an internal mammary LN in the second intercostal space with short axis of 3 mm, long axis of 7 mm and preserved fatty hilum. (B) Diffusion weighted imaging shows a high-signal-intensity of LN (arrow). (C) Apparent diffusion coefficient map shows a low-signal-intensity (arrow). Initial (D) and after 1 year and 1 month (E) PET/CT reveals absence of focal FDG uptake in the same location of left internal mammary LN (arrow).