Mantle cell lymphoma and diffuse large B-cell lymphoma of the testis: a unique case of composite non-Hodgkin lymphoma

Abstract Primary testicular non‐Hodgkin lymphoma ( NHL ) is a rare entity with the most common histologic subtype consisting of diffuse large B‐cell lymphoma ( DLBCL ). Patients with primary testicular lymphoma ( PTL ) have a poor prognosis and a higher propensity for relapse. Also rare are composite lymphomas ( CL ) defined as two or more morphologically and phenotypically distinct lymphomas coexisting in a single organ or tissue. Here we present the first reported case of primary testicular composite lymphoma consisting of DLBCL and mantle cell lymphoma ( MCL ).