LAUSR

Primary breast lymphoma is a rare neoplasm; it corresponds to 0.4–0.5% of breast tumors1 and is defined as the absence of concurrent widespread lymphoma, having no previous diagnosis of extramammary lymphoma. It is an infrequent tumor, as lymphoid tissue is absent in the mammary region.2 It is especially prevalent in females (95–100%), representing little more than a mere anecdote in males.3 The PET/CT can be useful in the initial staging, treatment response evaluation, and restaging of patients with primary breast lymphoma. An 81-year-old man with a personal history of stage II colon adenocarcinoma that was completely resected in 2015, and who is currently in remission, has been diagnosed with a painless tumor in the left breast. The examination showed a 5-or-6cm hard lump under the left nipple without palpable peripheral adenopathy. The left breast ultrasound demonstrated a hypoechoic and non-homogeneous mass measuring 35 mm in the lower inner quadrant. These sonographic findings were