RT Book, Section A1 Silva, Fernando R. A1 Mills, Lisa D. A2 Ma, O. John A2 Mateer, James R. A2 Reardon, Robert F. A2 Joing, Scott A. SR Print(0) ID 57790831 T1 Chapter 7. Pulmonary T2 Ma and Mateer's Emergency Ultrasound, 3e YR 2014 FD 2014 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-179215-8 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=57790831 RD 2024/04/24 AB The lungs have traditionally been considered a barrier to ultrasound imaging because large changes in acoustic impedance result in ultrasound reflection and the acoustic impedance of air is extremely low compared with anatomic tissues. It was not until 1986 that the diagnosis of pneumothorax with ultrasound was reported in veterinary medicine.1 In 1995, Lichtenstein published his landmark paper describing the most fundamental element of pulmonary ultrasound, the lung sliding sign.2