Figure 4. In A, computed tomography angiography image, with lung window settings, showing a round lesion characteristic of subpleural pulmonary infarction with the reversed halo sign (white arrow) in the right lower lobe, comprising heterogeneous areas of low attenuation and no evident reticulation. In B, computed tomography angiography image, with mediastinal window settings, showing a small filling defect (white arrow) in the segmental branch that connects the right pulmonary artery to the lower lobe.