Primary carcinoma of the fallopian tube is a very unusual gynecologic malignancy that accounts for less than 1% of all malignancies of the female genitalia. A 55-year-old, gravida 7, para 3 woman presented with no gynecologic complaints other than backache. TVS demonstrated a 35 x 25 mm heterogeneous mass that was not clearly separated from the left ovary, and another 34 x 14 mm cystic septated lesion in the left ovary region. Pelvic MRI demonstrated a 35 x 35 x 20 mm left adnexal mass that enhanced with contrast and a neighboring tubular-cystic mass. Upper and lower gastrointestinal endoscopy revealed no malignancy. Serum CA 125-level was merkedly elevated at 369 U/ml (normal < 35 U/ml). Laparotomy revealed left hydrosalpinx and a papillary-fimbrial mass. Pelvic lymph node metastases were observed. Frozen-section analysis identified the mass as a serous adenocarcinoma. Total abdominal hysterectomy, bilateral salpingo-oophorectomy, appendectomy, omentectomy, pelvic and para-aortic lymph node dissection, and peritoneal washing were performed. The definitive histopathological diagnosis was primary serous adenocarcinoma of the fallopian tube with six of 25 lymph node biopsies showing metastasis. Six cycles of paclitaxel (175 mg/m(2)) plus cisplatin (75 mg/m(2)) combinatin chemotherapy were administered with 3-week intervals between cycles. Second-look laparotomy was performed; there was no evidence of disease. At the time of writing 12 months after the second-look laparotomy, she was still disease-free.