Fig. 1

Imaging of primary breast diffuse large B cell lymphoma in a male patient. B-ultrasound of the breast revealed a low-echo mass behind the right nipple with clear boundaries, irregular shape, and uneven internal echo (A). Color Doppler flow imaging (CDFI) showed a blood flow signal around the mass (B, star). Systemic positron emission tomography/computed tomography (PET/CT) showed abnormally elevated dextrolactose metabolism (C and D, arrow), which was considered a malignant lesion