This 45 year old patient has a known elevated left hemidiaphragm seen previously on x-ray.
Ultrasound was suggested to rule out diaphragmatic paralysis.
Pic #1: On the right hemidiaphragm, satisfactory movement and contractility is noted. M-mode showed diaphragm excursion of 4.02 cm
Pic #2: On the left hemidiaphragm, ultrasound revealed very little or no movement and contractility. This is depicted by a flat line in M-mode.