Long-term postoperative follow-up of a patient with a borderline serous tumor arising from a paratubal cyst: a case report and review of the literature

Background: Borderline paratubal cysts (BPC) are extremely rare, with only nine cases reported in the literature. Case Report: A 40-year-old woman presented with a large adnexal mass on gynecological examination. The abdominopelvic computed tomography scan revealed a 20×16-cm-sized cystic adnexal mass that contained no solid portion. The CA 125 level was elevated. She underwent a left salpingectomy with paratubal cystectomy, and frozen-section analysis revealed that the mass was benign. However, the final pathological diagnosis was borderline serous paratubal cyst. The patient underwent another surgery, i.e., ipsilateral oophorectomy with contralateral ovarian biopsy. She was followed up for ten years postoperatively, and no recurrence was observed. Conclusion: BPCs are extremely rare, and thus, optimal management methods are unknown. However, conservative surgery is performed in most cases. This is the longest reported follow-up after conservative surgery in a case of BPCs. Continued reporting of BPCs is essential for understanding their prognosis and treatment.

Paratubal cyst; Borderline paratubal cysts.

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