theoretic etiologic mechanisms for the development of late retroperitoneal tumors in these men are discussed , including ( 1 ) metastatic disease from a second primary tumor in the remaining testicle , ( 2 ) a primary extragonadal retroperitoneal tumor , and ( 3 ) delayed transformation of metastatic teratomatous retroperitoneal tumor from the original primary into malignant neoplasm .
C0035358
retroperitoneal tumors
C0035359
retroperitoneal