Concurrence Of Bilateral Morphologic Left Lungs And Pulmonary Artery Sling

Right Pulmonary Artery Sling in a Single Lung with Bronchial Isomerism

“…This possibly reverses the whole embryology, though a mirror image isomerism can possibly explain why right rather than left pulmonary artery sling can happen, especially with left lung aplasia. Similarly, the report by Samad et al shows the presence of two left pulmonary arterial slings, positioned bilaterally with left visceral isomerism, supporting such a theory.…”

“…The RPA sling is possible only in an isomeric setting . This possibly reverses the whole embryology, though a mirror image isomerism can possibly explain why right rather than left pulmonary artery sling can happen, especially with left lung aplasia.…”

Pulmonary artery sling: An overview

“…Compression of the primitive right lung structures and flow competition from the left post‐branchial primitive pulmonary vessel (future LPA) which causes the sling can result in hypoplasia of the right lung and associated tracheal stenosis. The right PAS is possible only in an isomeric setting with an associated left lung hypoplasia 15,16 . The “space availability theory” may offer a possible explanation for some associated congenital heart defects in LPAS.…”

“…associated left lung hypoplasia. 15,16 The "space availability theory" may offer a possible explanation for some associated congenital heart defects in LPAS. Since there will be extra room available due to abnormal origin of the LPA during the development, more space would be available on the left side in the splanchnic mesenchyme for the unrestricted growth of the primitive left sixth arch and the left common cardinal vein for a patent ductus arteriosus and left superior vena cava respectively.…”

Pulmonary artery sling: An overview.

“…The right pulmonary artery sling is possible only in an isomeric setting with an associated left lung hypoplasia. 16,17 Many associated congenital heart defects in LPAS can be explained on the basis of space availability theory. Since there will be an extra space available due to abnormal origin of the LPA during the development, this would leave roomier left side in the splanchnic mesenchyme for the unrestricted growth of the primitive left sixth arch and the left common cardinal vein resulting in increased occurrence of patent ductus arteriosus and left superior vena cava respectively.…”