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Epithelioid trophoblastic tum or is a rare type of gestational trophoblastic disease that is distinct from placental site trophoblastic tum or and chorio-carcinom a, and epithelioid trophoblastic tum or has features resem bling a carcinom a. We report here on an epithelioid trophoblastic tum or that was discovered as a solitary pulmonary nodule in the lung of a 50-year-old woman. The patient had suffered from a hydatidiform mole 20 years previously. Wedge resection of the lung was done and this showed a 1.9x1.5 cm sized, relatively well defined m ass com posed of m ononuclear tum or cells adm ixed with hyaline-like m aterial and necrosis. The tum or cells were positive for EMA, Cam5.2, α-inhibin, PLAP and hCG. After consulting the gynecologic depart-m ent, a 7.5×6.5 cm sized m ass was discovered in the uterine fundus. Hysterectom y was then done. The tum or cells were sam e to those of the lung mass. The lung mass is considered to be metastasis from the epithelioid trophoblastic tumor of the uterus. She has been an uneventful clinical course for three years. (J Lung Cancer 2009;8(2):114 117) Key Words: Lung, Trophoblastic neoplasms, Metastasis, Gestational tropho-blastic neoplasm