CD56+lymphoma presenting as a testicular tumor

A case of an unusual lymphoma type, CD56 (+) T/NK lymphoma, presenting as a testicular tumor is described. A 35 year old man who presented with right testicular swelling, underwent right inguinal orchiectomy, with a presumpti ve diagnosis of abscess or malignancy. Histopathology showed a diffuse mixe d large and small cell lymphoma with a focal angiocentric growth pattern. I munohistochemically CD45RO and CD56 were found to be positive in the neopla stic cells. Insitu hybridization assay for EBV showed the presence of EBV r elated small ribonucleic acid sequences (EBER) within the tumor cells. Desp ite systemic chemotherapy, the patient had an aggressive clinical course wi th two skin and left testicular recurrences in the first year of his diseas e.