"osteoblastoma: accounts for ~17% of spinal osteoblastoma(s) 2"
"pre-sacral tumoursgerm cell tumours"
"Ewing sarcoma / pPNET"
"Extramedullary haematopoiesis"
"Currarino triad"
Expected headings
"Tumours"
"Developmental lesions"
"Other lesions"
"Syndromes"