*2.2.1 Rationale for SHPB in uterine adenomyosis*

The superior hypogastric plexus consists of the lumbar splanchnic nerves (from the L3–L4 sympathetic ganglia) and the abdominal aortic plexus, which distributes its fibers to the anterior sacral promontory of the L5 vertebral body below the iliac bifurcation of the abdominal aorta [13]. The superior and inferior ventral nerve block was derived from the sacral neurotomy 20 years ago. Under the guidance of CT, the puncture needle was placed around the superior and inferior ventral nerve in front of the cone, and anhydrous alcohol or other nerve blockers were used to block the nerve so that local pain cannot be transmitted back to the brain through the nerve, to achieve the purpose of analgesia [14].
