Fig. 2From: Percutaneous cryoablation of chondroblastoma and osteoblastoma in pediatric patientsInsulation technique: epidural pneumo-dissection. Osteoblastoma in a 17-y.o patient. a Axial T2 MR image shows an expansile lesion in the posterior elements of L5 (red arrow). b, c Axial CT images show cryoprobes (white arrows) and epidural needle (dashed arrow) for pneumo-dissection system (circle) used to protect L4 and L5 nerve rootsBack to article page