This movie depicts normal lung sliding with the additional finding of B-lines. B-lines are an abnormal finding and indicate increased lung density due to pulmonary edema, pus, intraparenchymal hemorrhage, or other pathology. B-lines are perpendicular to the pleura, extend to the bottom of the image without fading, and move synchronously with respiratory movements.
Courtesy of Joshua Zimmerman, MD, FASE, and Nathaniel Birgenheier, MD.