Primary Testicular Lymphoma a Rare Extra Nodal Involvement of NHL

Primary testicular lymphoma is a collection of neoplasms that constitutes only 1–9% of testicular tumors. Although uncommon in the general population, it is the most common type of malignant testicular tumor in men ≥50 years of age. There are various subtypes, including diffuse large B-cell lymphoma (DLBCL), Burkitt’s lymphoma and follicular lymphoma. In the adult testis, primary DLBCL represents the most frequent subtype of lymphoma (80–90%), whereas the majority of testicular lymphomas in children consist of secondary involvement by Burkitt’s lymphoma, DLBCL or lymphoblastic lymphoma. The typical clinical sign is a painless testicular mass of variable size that is usually unilateral. Primary testicular lymphoma may be identified during the initial presentation of primary or systemic malignant lymphomas, or during a clinical follow-up of patients with lymphoma. Historically, primary testicular lymphoma has been reported to exhibit a poor prognosis with an overall 5-year survival rate of 17–48%, particularly primary testicular DLBCL, whose clinical behavior has been reported to be aggressive and to demonstrate a high propensity to disseminate to the central nervous system (CNS) and skin at presentation and relapse. The underlying mechanisms responsible for this aggressive behaviour have yet to be elucidated. In the present study, a patient with primary testicular DLBCL was examined from histological examination and immunohistochemical staining in the diagnosis of testicular DLBCL.