Clinical Study

Dorsal Penile Nerve Block via Perineal Approach, an Alternative to a Caudal Block for Pediatric Circumcision: A Randomized Controlled Trial

Figure 2

The ultrasound-guided dorsal penile nerve block via perineal approach. (a) an ultrasound image of a penile neurovascular sheath before a complete nerve block injection; (b) an ultrasound image of a penile neurovascular sheath after a complete DPNB injection. On the ultrasound image, injected local anesthetics were shown as a black hypoechoic area, firstly filled in one side of the neurovascular sheath and then spread to the opposite side.
(a)
(b)