Fig. 3
SNHB after UFE a Abdominal aortogram (bone window) in a caudal projection delineates the aortic bifurcation and iliac vessels as well as L5 vertebral body. An ideal location is a triangular area below the bifurcation (white triangle) b A 21 G needle is advanced anteriorly till bony resistance is felt when it contacts the anterior L5 vertebral margin. c Contrast injection shows the characteristic triangular blob of contrast (white triangle) with no vascular opacification. d The imaging intensifier is them moved to a lateral position to confirm position of tip off needle (black arrow) abutting the anterior margin of L5 vertebral body