# Giant Retroperitoneal Mass During Pregnancy With an Unexpected Diagnosis: Ovarian Cyst or Something Else?

## TL;DR

A pregnant woman with a large abdominal mass was found to have a rare benign hydatid cyst, highlighting the need to consider unusual diagnoses during pregnancy.

## Contribution

This case report highlights the rare diagnosis of a suprarenal hydatid cyst in pregnancy and emphasizes its management considerations.

## Key findings

- A 30-week pregnant woman presented with a large retroperitoneal mass initially mistaken for an ovarian cyst.
- Histopathology confirmed a benign suprarenal hydatid cyst, a rare condition in pregnancy.
- Surgical intervention and successful pregnancy outcome were achieved with multidisciplinary care.

## Abstract

Abdominal masses during pregnancy are uncommon and challenging to diagnose. Anatomical changes and imaging limitations often complicate evaluation. We present the case of a 30-year-old woman at 30 weeks of gestation who was admitted with progressive abdominal distension and discomfort. Initial ultrasound suggested a large ovarian cyst, but further imaging revealed a giant retroperitoneal mass. An exploratory laparotomy identified a cystic lesion over 25 cm in size containing approximately nine liters of citrine fluid. Partial resection was performed with preservation of maternal stability, and histopathology confirmed a benign suprarenal hydatid cyst. Postoperative recovery was favorable, and the pregnancy progressed without complications. At 39 weeks of gestation, the patient underwent cesarean section and delivered a healthy neonate. Both mother and child remained stable and were discharged in good condition. This case illustrates the importance of considering retroperitoneal pathology in the differential diagnosis of abdominal masses during pregnancy. Hydatid disease, although rare, should be considered in patients from endemic regions, particularly when imaging findings are atypical. Surgical management during pregnancy, while complex, can be safe and effective when conducted in an experienced, multidisciplinary setting.