A 57-year-old woman with invasive ductal carcinoma in the right breast. (a)
18F-FDG PET/CT shows focal FDG uptake in the right upper outer breast with a maximum standardized uptake value (SUVmax) measured at 13.6. The tumor grade was III. On immunohistochemical study, ER and PR were negative and Ki-67 and EGFR were positive. (b)
18F-FDG PET/CT at axillary level shows focal FDG uptake in the right axillary lymph node with a SUVmax measured at 5.8. On histologic examination, right axillary lymph node metastases were noted in 7 of 16 dissected lymph nodes. EGFR, epidermal growth factor receptor; ER, estrogen receptor; 18F-FDG PET/CT, 18F-fluorodeoxyglucose positron emission tomography/computed tomography; PR, progesterone receptor.