Lymphoma and metastatic breast cancer presenting with palpable axillary and inguinal lymphadenopathy in a 40-year-old man with rheumatoid arthritis on anti-tumor necrosis factor α therapy: a case report

一例40岁男性类风湿性关节炎患者，接受抗肿瘤坏死因子α治疗期间出现腋窝和腹股沟淋巴结肿大，并被诊断为淋巴瘤和转移性乳腺癌的病例报告