Figure 1: Diaphragm ultrasound at the Zone of Apposition. Figure 2: Diaphragm thickening. In Figure 2, a linear array transducer (more than 10 MHz) is placed in the midaxillary or anterior axillary line in the coronal plane, along the ZOA between the eighth and ninth intercostal space. The upper image is taken in B-mode. The lower image is taken in M-mode and shows the diaphragm thickening during inspiration. 12 Ban et al described a simple technique (Figure 3) for evaluation of the diaphragm: ABCDE. A linear array transducer is placed parallel to the anterior axillary line just caudal to the level of the nipple. Lung sliding superficial to the diaphragm during breathing will be evident as a bright hyperechoic shadow entering the field of view American Society of Regional Anesthesia and Pain Medicine 2018