Fig. 1

Findings of ultrasound and PET-CT scan. a Ultrasonography revealed a 40-mm tumor with an irregular shape. Internal echo was a mixture of low and high levels, suggesting that fibroadenoma, breast cancer, and sarcoma should be included in the differential diagnosis, along with lymphoma. b PET-CT scan showed high FDG uptake in the right breast (blue arrow). There were no abnormal hot spots in other organs, including the ipsilateral axilla