Abstract
A 40-year-old woman who showed upon routine check-up an abnormal mass shadow in the right lung was admitted to our hospital. Chest CT scan showed a mass shadow in the right S4. Preoperative diagnosis was not obtained. As an intra-operative frozen section showed carcinoma, a right middle lobectomy with lymph node dissection was performed. A definitive histologic examination demonstrated a choriocarcinoma. The pathological classification was T1N0M0, stage IA. Although the serum HCG and beta-HCG levels were still high at 1 week after surgery, these values returned to normal limits at 3 weeks after surgery. Chemotherapy was started at 4 weeks after surgery and consisted of Methotrexate, Actinomycin D, and Cyclophosphamide. At 7-year follow-ups, the patient was alive with no recurrence.
