Pulmonary arterial webs
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 4.
Pulmonary arterial webs are a late sequelae of chronic pulmonary thromboembolism.
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 2. They are usually orientated along the direction of blood flow along the long axis of the vessel.
- 1. Korn D, Gore I, Blenke A et-al. Pulmonary arterial bands and webs: an unrecognized manifestation of organized pulmonary emboli. Am. J. Pathol. 1998;40: 129-51. Free text at pubmed - Pubmed citation
- 2. Wittram C, Kalra MK, Maher MM et-al. Acute and chronic pulmonary emboli: angiography-CT correlation. AJR Am J Roentgenol. 2006;186 (6_supplement_2): S421-9. doi:10.2214/AJR.04.1955 - Pubmed citation
- 3. Fedullo P, Kerr KM, Kim NH et-al. Chronic thromboembolic pulmonary hypertension. Am. J. Respir. Crit. Care Med. 2011;183 (12): 1605-13. doi:10.1164/rccm.201011-1854CI - Pubmed citation
- 4. Ghez O, Saeed I, Serrato M et-al. Surgical repair of pulmonary artery branches. Multimed Man Cardiothorac Surg. 2012;2013: mmt014. Multimed Man Cardiothorac Surg (full text) - doi:10.1093/mmcts/mms010 - Pubmed citation