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Sonoanatomy and technique of the erector spinae plane block. (A) The ultrasound transducer is placed longitudinally, 2 to 3 cm lateral to the T5 transverse process, under aseptic conditions. The needle is inserted in a cranial-to-caudal direction in-plane; (B) correct needle tip placement is identified by hypoechoic local anesthetic under the erector spinae muscle, setting it apart from the transverse processes.
