Ovarian endodermal sinus tumor during pregnancy

We present the rare case of a 31-year-old pregnant woman who underwent resection of a FIGO stage Ia ovarian endodermal sinus tumor at 7 weeks of gestation, and who received no additional treatment, before or after giving birth. She was delivered of a healthy male infant at 40 weeks of gestation, and exhibited no signs of recurrence 28 months after the primary operation. There are 14 previous reports of endodermal sinus tumors during pregnancy. The present case represents the first patient who gave birth to a healthy infant without receiving any additional treatment following surgery, indicating that an early-stage endodermal sinus tumor does not necessarily require adjuvant chemotherapy.