Serous Borderline Tumor Arising in a Paratubal Cyst: Case Report and Review of the Literature

Abstract

Paratubal cysts are relatively common adnexal findings; however, serous borderline tumors (SBTs) arising from these cysts are exceedingly rare. In this report, we present a unique case of a serous borderline tumor originating from a paratubal cyst in a 41-year-old female who underwent total laparoscopic hysterectomy with bilateral salpingectomy.

The patient presented with pelvic pain, dysmenorrhea, menorrhagia, and dyspareunia. Intraoperatively, a 0.6 cm paratubal cyst was identified in one of the fallopian tubes. Histopathological analysis revealed the presence of a serous borderline tumor within the cyst.

We reviewed the existing literature on paratubal cysts harboring borderline tumors, highlighting reported cases, clinical presentations, histological characteristics, and management strategies. We also discuss possible etiological factors, including a potential link with metabolic disorders.

This case adds to the limited number of reported SBTs arising in paratubal cysts and underscores the importance of histological evaluation even in seemingly benign adnexal lesions.

[N A J Med Sci. 2026;19(1):004-007.   DOI:  10.7156/najms.2026.1901004]