[An unusual localization of solitary bone cyst in a child: the lumbar spine].

Solitary bone cysts involving the spine in children are extremely rare. We report such a lesion in a 7-year-old girl who presented with an expansible, bubbly cystic lesion of the third lumbar vertebra. The intraoperative findings and histologic examination indicated the diagnosis of a solitary bone cyst. She was treated successfully with curettage and bone grafting.