Paraovarian tumor of borderline malignancy: A case report.

Paraovarian tumors of borderline malignancy (PTBM) are exceedingly rare, with only slightly over 60 cases reported worldwide. This report presents the case of a 22-year-old nulliparous patient who incidentally discovered a left paraovarian mass during a routine abdominal ultrasound. Subsequent MRI revealed a 2.5×2.1 cm cystic lesion located in close proximity to, but outside of, the left ovary, with no other pathological findings. A laparoscopic cystectomy was performed with meticulous care to prevent tumor spillage, and the patient experienced an uneventful recovery. Histopathological examination unveiled irregularly shaped tissue measuring 2.2×1.2×1 cm, characterized by fibrous tissue/wall with spindle cell stroma and an epithelium displaying features consistent with a serous borderline tumor. Our multidisciplinary team recommended diligent follow-up. This case contributes to the existing literature on PTBM and highlights the imperative for additional cases to enhance our comprehension of the optimal management of these exceedingly rare tumors.