Bilateral Synchronous Testicular Plasmacytoma as Extramedullary Relapse in High-Risk Multiple Myeloma Patient

Testicular Plasmacytoma is a very rare neoplasm, even more bilateral and synchronous forms. We report a young multiple myeloma patient, with a high risk disease early relapsing after autologous stem cell transplantation presenting bilateral and synchronous testicular plasmacytoma. In this case, implementation of PET/CT pre-allogeneic stem cell transplantation allows detecting an early and asymptomatic testicular relapse. After combination of orchidectomy, radiotherapy, chemotherapy and allogeneic stem cell transplantation, the patient is currently disease-free and alive.