A rare cause of lower urinary tract symptoms: retrovesical hydatid cyst

Retrovesical cysts are extremely rare. for differential diagnosis radiologic findings and serologic tests can be used. in this article, we aimed to report our approach to diagnose and to treat a primary huge hydatid cyst in retrovesical space, between sigmoid colon and bladder. a 34-year old patient presented to our hospital with lower urinary tract symptoms (luts). abdominal ultrasound reported a 14x8 cm cystic lesion adjacent to the posterior wall of the bladder. computerized tomography revealed a 14x8 cm cystic mass adjacent to bladder posteriorly and prostate and seminal vesicle anteriorly in the retrovesical space. patient received albendazole prophylaxis and intervention was planned by transperitoneal approach. in a two-year of follow-up patient did not encounter any recurrences. retrovesical cysts may cause luts. with patients suffering from luts, hydatid cyst should be kept in mind.