PMC7685363_01
CT pulmonary angiography: Axial image (A) demonstrates a small thrombus (arrow) in a segmental artery of the right lower lobe. Dual-energy spectral image (B) at the same level better defines the small arterial thrombus (arrow) with pulmonary perfusion preservation in the distal parenchyma *. Normal flow into arterial pulmonary vessel is depicted in a color scale varying from red to white (depending on vessel opacification). Arterial thrombus is depicted in yellow in a partially permeable lumen (in red). Normal perfusion of lung parenchyma is shown in blue. Coronal average (C) and virtual reality reconstructions (D) show a normal lung parenchyma with no findings suggestive of COVID-19 pneumonia.
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It demonstrated an obstruction of the posterior-basal and anterior-basal segmental branches of the right lower lobe (RLL) (Figure 1), with no associated areas of consolidation, crazy-paving or ground-glass opacities.