18F-FDG PET/CT Versus 18F-FAPI PET/CT in a Case of Recurrent Malignant Phyllodes Breast Tumor.

ABSTRACT A 52-year-old woman with medical history of surgery for left malignant phyllodes breast tumor found a mass on the left chest 3 months ago. A suspicion of recurrent malignant phyllodes breast tumor was made. The patient was enrolled in the clinical trial of 18F-FAPI PET/CT in recurrent sarcoma (no. NCT05485792). 18F-FAPI PET/CT and 18F-FDG PET/CT were performed, and the images demonstrated intense uptake in a huge mass in the left anterior chest wall. Then the patient underwent extended resection of left chest wall tumor. The tumor proved to be recurrent malignant phyllodes breast tumor pathologically.