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Background: Primary fallopian tube cancer is an extremely rare gynecological malignancy. Aim: To discuss, through a case report, the diagnostic process by means of cytology immunohistochemistry. Case Presentation: A 47-year-old Japanese woman, who also had lung cancer, presented with enlarged para-aortic lymph node without any symptoms. Based on the vaginal cytology report suggestive of gynecologic malignant tumor (possibly fallopian tube adenocarcinoma), primary surgery comprised of total abdominal hysterectomy and bilateral salpingo-oophorectomy was performed. Histopathology and immunohistochemistry examinations revealed primary fallopian tube carcinoma with metastasis of para-aortic lymph node. She is free from recurrence and metastases 9 months after the surgery and chemotherapy. Conclusion: Although primary fallopian tube cancer is a rare gynecologic malignancy, vaginal cytology may be useful for detecting fallopian tube carcinoma.

An 84-year-old woman suffered from post-menopausal genital bleeding for 3 months. Based on the endometrial cytological findings (suggestive of high grade neuroendocrine carcinoma) showing that there were rosette-like and cord-like structures consisting of small rounded tumor cells with oval nuclei and scanty cytoplasm, radical hysterectomy was performed. Histopathological and immunohistochemical examinations on the operated specimens revealed primary high grade neuroendocrine carcinoma of the endometrium. Despite the extensive treatment against the malignancy, the patient died due to widespread metastases after 5 months after the surgery and autopsied.