Figure 3a: Transverse contrast-enhanced CT scans show consolidation with central lucencies in a 68-year-old woman with pulmonary infarction in the upper lobe of the left lung. (a) Mediastinal window setting. (b) Lung window setting. The central portion of hypoattenuation, better seen on a than on b, is surrounded by dense consolidation (arrow), which probably reflects a peripheral inflammatory reaction. Air bronchograms are absent. This patient had PE involving several segmental and subsegmental pulmonary arteries (not shown).