[Syphilitic orchitis: a case report].

Syphilitic orchitis is recently a rare disease in Japan. A 75-year-old man was referred to our hospital with the complaint of persistent swelling of the left scrotal contents in spite of prior antibiotic therapy. We suspected a testicular tumor because of lack of pain, and performed high orchiectomy. The specimen showed wide-ranged necrosis with a non-specific inflammatory change of the testis on hematoxylin-eosin stain. After performing analysis using a polymerase chain reaction method, we reached the final diagnosis of syphilitic orchitis.