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(A) Sagittal parasternal scan; (B) Sagittal parasternal scan with markings. Note that TTM appears as a hypoechoic band folding over the hyperechoic pleura. PMAJOR, pectoralis major muscle; EIM, external intercostal muscle; IIM, internal intercostal muscle; INNIM, innermost intercostal muscle; TTM, thoracic transversus muscle; P1, target plane for PIFB; P2, target plane for TTMPB.
