Sixty-three patients (15 months to 17 years of age) with ovarian tumors were seen. Fifty-six patients had germ cell tumors and 7 epithelial tumors, 6 patients had bilateral tumors, 47 patients had teratomas (41 benign, 3 with embryonic tissue, and 3 malignant), 6 germinomas, 1 endodermal sinus tumor, and 2 mixed germ cell tumors. Of the patients with epithelial tumors, six had cystadenomas and one cystadenocarcinoma. Abdominal pain was the most common symptom, and an abdominal mass the most common sign. A calcification on abdominal films was seen in 29 patients with benign teratoma. At surgery, the opposite ovary was bivalved or biopsied in 31 patients with benign tumors. Two patients had teratomas burried in the ovarian tissue. Among 47 patients with benign tumors, 37 have remained well after the operation and 10 were lost to follow-up. Two girls with embryonic teratoma are well 71 and 19 months after diagnosis but the third died with embryonal carcinoma. Of the 13 patients with malignant tumors, 8 are alive disease free 4 1/2 to 17 years after diagnosis, 4 are dead, and 1 is lost to follow-up (disease free 15 months after diagnosis).