Look for B-lines which how as vertical echogenic short artifacts. They start at the pleural line and extend down through the ultrasound image.
Occasional B-lines are considered normal. However, more than 3 in a single view is abnormal. Sometimes, there are numerous B-lines in close proximity and they become confluent.
B-lines can originate from cardiogenic and noncardiogenic pulmonary edema.
Interstitial thickening due to fibrosis or lymphangitis can also create the sonographic appearance of diffuse B-lines.
- B-line interrupt any horizontal A-lines.
- B-lines move with lung movement.
- Other pathological processes such a pulmonary fibrosis can create the appearance of diffuse B-lines.