'Burned-out' Seminomatous Testicular Tumour Diagnosed as Retroperitoneal Metastasis, A Rare Case

"Burned-out testicular tumour" is extremely rare. Burned-out phenomenon describes partially or completely regressed germ cell tumours of the testes diagnosed after metastases in several parts of the body; including the mediastinum, cervical and axillary lymph nodes, retroperitoneal lymph nodes, and the retroperitoneal region. Physical examination of the testicles reveals non-specific findings. A 31-year-old male presented with abdominal and back pain. The physical examination findings were unremarkable. Imaging with computerized tomography showed a retroperitoneal mass. Excision of the retroperitoneal mass and the paraaortic, paracaval, and retroperitoneal lymph nodes was performed. The postoperative period was uneventfuland he was discharged on the postoperative 5thday. The postoperative pathological examination of the specimen reported a metastatic seminoma. Investigation of the underlying cause of a retroperitoneal mass in young adults requires including metastasis of burned-out germ cell tumours in the differential diagnosis. Further case reports on this rare type of tumour are required so that all potential risk factors will be defined and treatment protocols will be updated to optimize the management of the patients with burned-out germ cell tumours