Table 1 Diagnostic ultrasound and radiographic criteria of the 4 main variables [9, 10]

Pneumothorax

- Absence of pleural sliding and B lines.

- Lung point sign.

- Barcode sign.

- Increased normal radiolucency, making the edge of the visceral pleura visible.

Pleural effusion

- Anechoic or hypoechoic pattern separating the visceral and parietal pleura with changes during respiration.

- Increased homogeneous density superimposed over lung fields.

Pulmonary consolidation

- Tissue model (pulmonary hepatization).

- Presence of air alveologramas (pinpoint, linear, or hyperchogenic images).

- Heterogeneous opacity or air bronchogram with loss of normal radiolucency.

Interstitial pattern

- Presence of more than 3 B lines in the anterior and lateral regions of the thorax.

- Collection of innumerable small linear opacities that, in sum, produce a network-like appearance.

- Kerley B Lines.