Fallopian tube cancer with inguinal lymph node metastasis as the first symptom: A case study and review of the literature

Introduction and importance: Fallopian tube cancer that is characterized only by inguinal lymph node metastasis without intra-abdominal widespread is rare. Here we report a patient with primary Fallopian tube cancer with bilateral inguinal metastases as the first symptom. Case presentation: A 68-year-old patient with primary Fallopian tube cancer, with painless bilateral inguinal enlargement (7 x 6 cm on the right side, 3 x 2 cm on the left side) as the only manifestation, was confirmed by preoperative biopsy as metastatic high-grade serous denocarcinoma, consider the adnexal or peritoneal source. Pelvic MRI, abdominal CT and PET-CT showed irregular signal foci can be seen in the right adnexal area, with a maximum cross-section of about 7.5 x 7.0 x 4.0 cm, considering malignancy, ovarian cancer may be possible; bilateral pelvic wall, bilateral inguinal, right iliac vessels with hypermetabolic lymph nodes. Serum CA125 level was markedly elevated at 922.40 U/ml and HE4 at 394.50 pmol/L. No abnormality was found in gastrointestinal endoscopy. At exploratory laparotomy, the tumor was confined to the right rear of the uterus, and a solid tumor with a size of about 10 x 6 x 6 cm was seen. The surface was smooth and closely related to the uterus. There was almost no tumor spread in the pelvic abdominal cavity, but there was 50 ml of pale blood-colored peritoneal fluid. The right ovarian capsule was intact. Cytoreductive surgery was performed, postoperative pathology confirmed adenocarcinoma of the right fallopian tube, and the patient received six cycles of paclitaxel plus cisplatin combination chemotherapy were administered, with three 3-weeks intervals between cycles. And subsequent the patient participated in a clinical trial. The work has been reported in line with the SCARE criteria. Clinical discussion: Literature review indicates that inguinal lymph node as the first manifestation of fallopian tube cancer is not usual, and with no widespread lymphadenopathies and abdominopelvic cavity are even rarer. This case shows that rare cases with only inguinal lymph node metastasis may occur through the underlying lymphatic and/or hematogenous routes. Conclusion: The diagnosis of tubal cancer is sometimes complicated and delayed. For elderly women without nonspecific symptoms, especially those with obvious masses, detailed examinations, and imaging studies should be carried out in time. The treatment of tubal cancer is multi-modal. Due to the high risk of recurrence of fallopian tube cancer, the possibility of metastasis after the initial diagnosis is large, so it is very important to receive close and regular follow-up for patients with fallopian tube cancer after treatment. We suggest that more tumor centers study the possible mechanisms, metastasis patterns, biological characteristics, etc. of such patients, and at the same time efforts should be made to early differential diagnosis, and ultimately prolong the survival time of such patients.