Serratus anterior plane-block. A linear probe 10-12 MHz was placed in a longitudinal scan between IV and V ribs over the right mid-axillary line to visualize ribs, LDm, SAm, and IIm muscles. Via in-plane approach 30 mL of levobupivacaine 0.5% are injected in a caudo-cranial direction.LDm: latissimus dorsi muscle; SAm: serratus anterior muscle; IMm: intercostal muscles; LA: local anaesthetic; Pl: pleura.