Galactocele, Pitfall for the Evaluation by 18F-FDG PET/CT.

A high F-18-FDG uptake was found in mammary lesions in a 36-year-old woman who underwent a PET/CT scan for initial staging of diffuse large B-cell lymphoma. The patient has given birth 2 months ago and was breastfeeding. Ultrasound-guided fine-needle aspiration of 1 lesion yielded creamy liquid consistent with milk and confirmed the diagnosis of galactocele.