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Lactating breast exhibiting high F-18 FDG uptake.

Fluorine-18 fluorodeoxyglucose (F-18 FDG) PET imaging in a 38-year-old woman showed elevated uptake in a lactating breast that resembled a large breast tumor. No mass was observed on physical examination and ultrasonography. During lactation, plasma glucose is used for milk production, and this probably accounts for the increased F-18 FDG accumulation.