[A case of primary testicular malignant lymphoma associated with contralateral testicular recurrence after a nine-year interval: a case report].

A 69-year-old man visited our hospital in February 1996 with a chief complain of left scrotal swelling. The left scrotal content was hard by palpation and ultrasonography showed a hypo-echoic lesion. Left high orchiectomy was performed with suspicion of a testicular tumor. Pathological examination demonstrated a diffuse large B-cell lymphoma (DLBCL) originating from the left testis, and then he underwent 5 courses of chemotherapy consisting of THP-COP (THP-adriamycin, cyclophosphamide, vincristin, predonisone). Following the treatment for five years, he had no evidence of recurrence. Nine years later, in October 2005, he noticed right scrotal swelling. He underwent right high orchiectmy with suspicion of a contralateral testicular malignant lymphoma. Pathological examination revealed DLBCL. He underwent chemotherapy (rituximab-THP-COP) and achieved complete remission again. He is doing well without recurrence of disease for three years after the last treatment.