[Retrovesical hydatid cyst. Apropos of 6 cases].

The retrovesical hydatid cyst is a very rare site. The authors have observed six cases over a 12-year period. The diagnosis is often delayed. The clinical features are dominated by pain and compression of adjacent organs. Clinical examination sometimes reveals a hypogastric mass. The topographic diagnosis is based on ultrasonography and IVU. Treatment is surgical: retroperitoneal cystopericystectomy. The course is often favourable.