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A four month old boy with pulmonary choriocarcinoma, showing iso-sexual precocious puberty is reported. His serum human chorionic gonadotropin (HCG) was highly elevated. A round isolated tumor in the right lung, found by chest X-ray, magnetic resonance imaging and gallium scintigraphy, was removed surgically a month and a half after clinical manifestations were noticed. It was determined to be choriocarcinoma on the basis of histological findings and positive HCG on histochemical examination. Skull irradiation and chemotherapy (cisplatinum, vinblastine and bleomycin) had only a transient effect on reducing tumor size and normalizing the serum level of HCG. This case suggests that a more effective treatment regimen needs to be established.
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