Primary syphilis presenting as a painful unilateral inguinal lymphadenopathy, without cutaneous manifestations, in a 71-year-old Japanese man: A case report by Kenji Yorita, MD, PhD, Chikane Ito, MD, Ai Fujioka, MD, Keisuke Kashiwagi, MD, Hiromichi Yamai, MD, PhD, Kimiko Nakatani, MD, Tatsuya Kumon, MD

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