Simple bone cyst (SBC), also known as a unicameral or solitary cyst, is a benign fluid-filled cavity found primarily at the proximal ends of long bones in children. Treatment is warranted if the pain or a pathologic fracture occurs or if a child is at ris Simple bone cyst (SBC), also known as a unameameral or solitary cyst, is a benign fluid-filled cavity was found at at the proximal ends of long bones in children. Treatment is warranted if the pain or a pathologic fracture occurs or if a child is at ris