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Fig. 18 | Insights into Imaging

Fig. 18

From: Pictorial review of the pulmonary vasculature: from arteries to veins

Fig. 18

Pulmonary sequestration. a Conceptual illustration of extralobar and intralobar sequestration. Note that extralobar sequestration involves venous drainage into the azygos system forming a left-to-right shunt while intralobar sequestration involves pulmonary venous drainage forming a left-to-left shunt. b Axial CT demonstrating an asymptomatic oval lesion (white arrow) in the left lower lobe consistent with extralobar sequestration in a 23-year-old woman. Blood supply is derived from the abdominal aorta with venous drainage occurring via the azygos system. Double oblique CT MIP images (c, d) and coronal CT MPR image (e) demonstrating an intralobar sequestration located within the pleura of the left lower lobe. Note the aberrant arterial supply to the lateral left lower lobe below the level of the diaphragm (black arrows) which extends through the diaphragm into the tissues of the left lower lobe (white arrows). Venous drainage of this intralobar sequestration is via the pulmonary venous system (arrowheads)

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