A 72-year-old woman noted a lump in her left supraclavicular fossa with no other symptoms or other signs on physical exam. A cervical biopsy indicated metastatic carcinoma. On the diagnostic workup: thoracic-abdominal-pelvic CT revealed augmented lymph nodes (LNs) in the retroperitoneum; Positron Emission Tomography-CT showed uptake in the LNs described and in two small areas in the pelvis; blood tests showed elevated CA125 and CA72.4. Another biopsy, considering a para-aortic LN, proved to be metastasis of a high-grade serous carcinoma (HGSC). Gynaecological exam and pelvic imaging were innocent. Diagnostic laparoscopy, including hysterectomy and bilateral adnexectomy, was performed and anatomopathological examination confirmed a HGSC in the fallopian tube (FT), in a tiny focus of 1.5 mm. The patient continued treatment with adjuvant chemotherapy. Literature review indicates that supraclavicular LN as first manifestation of FT carcinoma is not usual, and widespread lymphadenopathies with no macroscopic pelvic disease at diagnosis are even rarer.