A probable case of burned-out tumor of the testis detected after treatment for pulmonary choriocarcinoma

We encountered a patient who was suspected of having a burned-out tumor of the testis, which was detected after he was treated for pulmonary choriocarcinoma. The patient, a 61-year-old man, was found to have an abnormality on chest X-ray film at a medical examination in December 1989. He visited our department on December 19th, and was diagnosed as having cT1N0M0 (stage I) as a result of a thorough examination. He underwent right upper lobectomy and lymph node dissection on February 14, 1990. The lesion was pathologically diagnosed as choriocarcinoma, and after the operation he received orchiectomy and 3 courses of VAB VI therapy. After the chemotherapy, his blood HCG-beta level was normalized from 34 ng/ml to less than 0.10 ng/ml. The chest X-ray revealed complete disappearance of the coin lesion, while chest CT performed on July 25 revealed a small tumor 10 mm in diameter remaining in the left S10. For this tumor, partial resection of the left S10 was performed on August 6. The histopathological examination revealed nodular necrosis and disappearance of the tumor.