Pulmonary arterial webs

Netzartige

Residuen nach alter Lungenembolie in der rechten Unterlappenarterie: Links 3 Schichten axial, rechts 2 Schichten koronar.

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Pictorial

review of the pulmonary vasculature: from arteries to veins. Two patients with chronic pulmonary emboli. a Axial contrast-enhanced CT image shows a web-like filling defect within a segmental right lower lobe pulmonary artery consistent with chronic pulmonary embolus (white arrow). b Axial non-contrast CT image of another patient demonstrates linear calcification within the right interlobar pulmonary artery consistent with chronic pulmonary embolus (white arrow)

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In thoracic imaging, a pulmonary arterial web is given to describe fibrotic bands which are delicate ribbonlike structures anchored to the vessel wall at two ends with a free unattached mid portion. Sometimes a web also used to describe a bands that have branches and form networks of varying complexity. The term should not be confused with pulmonary artery banding which is a surgical technique to reduce pulmonary overcirculation in certain congenital heart diseases .

Pulmonary arterial webs are a late sequelae of chronic pulmonary thromboembolism.

Radigraphic features

CT - CTPA

There are typically seen as thin lines surrounded by contrast material. These bands generally range around 0.3-2 cm in length and from less than 0.1-0.3 cm in width . They are usually oriented along the direction of blood flow along the long axis of the vessel.

Webs are more often seen in the distal lobar or segmental arteries.