Which causes rib notching in a chest radiograph?
Which causes rib notching in a chest radiograph?
Rib notching occurs along the inferior margin of the third to the eighth ribs; it is caused by pulsation of dilated intercostal arteries. The major pathways of collateral flow include the following: Subclavian artery to the internal mammary artery to the intercostal arteries.
What is rib notch on xray?
Rib notching refers to deformation of the superior or inferior surface of the rib. It can affect a single rib (from trauma or solitary masses e.g. schwannoma) or can affect multiple ribs.
Why does neurofibromatosis cause rib notching?
The bilateral inferior rib notching is due to enlarged intercostal arteries due to collateral flow from the internal mammary arteries (these arise from the subclavian vessels bilaterally). This results in pressure erosion on the inferior aspect of ribs 3–9 bilaterally.
When does rib notching occur?
Bilateral notching could be seen after two years of age, but did not generally occur until five or six years.
What is meant by coarctation?
Coarctation comes from the Latin coartare, meaning “to press together.” In coarctation of the aorta, the aorta is pinched in or narrowed, either in a single location or along a portion of its length. This narrowing restricts normal blood flow through the aorta.
Why do intercostal arteries dilate in coarctation?
These posterior intercostal arteries dilate to accommodate the high pressure, and when the heart beats, they pulsate and literally rub up against the ribs, slowly wearing away bone.
What is an inferior rib?
The inferior costal facet (or inferior costal fovea) is a site where a rib forms a joint with the inferior aspect of the body of a thoracic vertebra. In the adjacent picture, the arrow points to an inferior costal facet. The facets are named for their location on the vertebral body, not the rib.
