Ultrasonograms of the classifications by thoracic ultrasound score categories (8 MHz). A bright hyperechogenic line (pleura) of demarcation between the intercostal muscles and the lung tissue is observed in all ultrasonograms. The ultrasonograms of normal lung surface are classified as TUSS1, where reverberation artefacts of the pleura are observed. The presence of comet tail artefacts (arrow head) is likewise included in this category. Ultrasonograms classified in the category TUSS2 and TUSS3 include presence of lung lesions (marked with stars) with < 2 cm2 and ≥ 2 cm2, respectively. In the category TUSS4, ultrasonograms of pulmonary emphysema (to the left) or complete consolidated lung lobe (to the right) are included. The heart is delimited by circular shape dashed line and lung lobe consolidation by triangular shape dashed line. Squares delimited with green lines in the ultrasonograms images represent 1 cm2 each. ICM, intercostal muscles; P, pleura; TUSS, thoracic ultrasonography score.