Isolated retrovesical location of hydadid cyst is a very uncommon cond
ition. Clinical patterns appear after a long course of the cyst. They
are represented by hypogastric mass associated with compressive manife
stations. Ultrasonography is essential for diagnosis and identificatio
n of other sites. When diagnosis is unclear, then CT scan plays a role
. Cystectomy and pericystic resection, as extensive as possible, is th
e adequate treatment that gives successful results in most cases.