Abstract
A 27-year-old man complained of fever and abdominal pain. Computed tomography (CT) revealed a cystic tumor, exceeding 3 cm in diameter, between the inferior vena cava under the left renal vein and abdominal aorta. No definitive diagnosis of the cystic tumor was reached after positron emission tomography CT and ultrasound guided fine needle aspiration. Four months later, CT revealed a massive cystic tumor, exceeding 6 cm in diameter. An operation was performed for diagnosis. Immunohistochemical staining was positive for CD34. Based on this finding, the tumor was diagnosed histologically as an embryonal carcinoma. Because it was thought to have come from one of the testes, the urologist removed it for diagnosis. The pathological findings from the testis indicated an embryonal carcinoma.
Based on this finding, the retroperitoneal tumor was diagnosed histologically as a metastasis from the embryonal carcinoma in the testis. When examining patients with retroperitoneal tumors, metastasis of testicular tumors should be considered in infants and young men.
