Erector spinae plane-block. A linear probe 10-12 MHz was placed in a longitudinal orientation 3 cm lateral to the T6 spinous process. Three muscles were identified superficial to the hyperechoic transverse process shadow as follows: Tm, RMm, and ESP. Via in-plane approach 20 mL of levobupivacaine 0.25% are injected in a caudo-cranial direction.Tm: trapezius muscle; RMm: rhomboid major muscles; ESP: erector spinae muscle; TP 6: transverse process of T6.