Retrovesical hydatid cyst: an unusual location of hydatid disease about a case series

Introduction and importance:Hydatid disease is an endemic zoonosis in regions with temperate climates where pastoral farming is common. Retrovesical localization is rare. Given the rarity of this entity, the lack of personal clinical experience, and the difficulty with detecting early symptoms, the diagnosis remains elusive for years. Methods:This is a 30-year retrospective, descriptive and analytic study of seven patients who were hospitalized and operated on in the Department of Urology during 30 years (1990-2019). Outcomes:The average patient age was 54 years (range: 28-76). Signs of bladder irritation were the predominant presenting complaint. No cases of hydaturia were noted. Preoperative diagnosis was based on ultrasonography and serology tests. Hydatid serology was positive for three patients. In three cases, a hydatid cyst of the liver was associated. A partial cystopericystectomy was performed for five patients, it was total for one patient. The resection of the prominent dome was realized once. No cystovesical fistula was found. The mean postoperative stay was 16 days. The postoperative course was uneventful for five patients. Urinary fistula occurred in one patient. One case of infection of the residual cavity was observed. One patient had a retroperitoneal cyst recurrence requiring reoperation. Conclusion:The preoperative diagnosis of retrovesical hydatid cysts is based mainly on ultrasonography. Open surgery is the treatment of choice. Different approaches are possible. Given the rarity of this entity, management should be guided by experienced experts.