Fig. 2From: Lung ultrasound—a primary survey of the acutely dyspneic patientComparing two scanning planes in LUS. a LUS performed in the longitudinal or cranio-caudal plane showed ribs (thin arrows) and their acoustic shadows (S). Just below the level of the ribs is the pleural line (thick arrow) and the sonographic lung field (SLF). b Subcutaneous tissue lines (arrowhead) could be mistaken for the pleural line (arrow) when LUS is performed in a transverse plane, without the guidance of the rib structureBack to article page