Primary retroperitoneal hydatid cyst: a rare case report.

Hydatid disease is a parasitic tapeworm infestation that usually involves liver and lungs. Primary retroperitoneal hydatid without liver and lung involvement is very rare. Surgery is the principle method of treatment for large retroperitoneal hydatid, whenever feasible. We report a case of primary retroperitoneal hydatid cyst in 29-year-old male patient.