Inhabitual case of sciatica in a child: presacral hydatid cyst

Hydatid cyst involving the pelvis in children is extremely rare. We report a case of an 11-year old boy with sciatic pain. Ultrasonography and computerised tomography scan showed a presacral cyst mass extending into the intervertebral foramen at the S1 level. The intraoperative findings and histologic examination indicated the diagnosis of a solitary hydatid cyst. After surgical enucleation, there was no envidence of recurrence on long-term follow-up