A 46-year-old woman with primary hyperparathyroidism and negative sestamibi parathyroid scan was referred for 18F-fluorocholine (18F-FCH) positron emission tomography (PET/CT) scan to help localize parathyroid adenoma. FCH PET/CT scan identified a hyperfunctioning parathyroid gland in the left neck. In addition, there was unusually intense unilateral FCH uptake in the right breast corresponding to dense soft tissue. Upon further questioning, the patient admitted to breastfeeding for the past year exclusively from the right breast. Breast MRI showed no corresponding abnormal signal. We present the imaging findings of unilateral breastfeeding on 18F-FCH PET/CT.
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