Magnetic resonance angiography (MRA) can detect luminal stenoses in the lower-extremity arteries greater than what percentage?

Magnetic resonance angiography (MRA) is a non-invasive imaging technique that is particularly effective in visualizing vascular structures and assessing the presence of stenoses (narrowing of blood vessels). When it comes to detecting luminal stenoses in the lower-extremity arteries, MRA has been shown to reliably identify significant vascular lesions.

The correct answer indicates that MRA can effectively detect luminal stenoses of 50% or greater. This is important clinically because stenosis of this magnitude typically has significant implications for blood flow and may require medical intervention or surgical procedures. Diagnosing such stenoses accurately is essential for patient management, particularly in cases of peripheral arterial disease.

Studies have demonstrated that MRA has a strong accuracy rate for detecting moderate to severe stenoses (typically defined as 50% or greater) in the lower extremities. This threshold is clinically relevant because stenoses below this percentage often do not lead to significant ischemia and may not require immediate intervention. Thus, understanding the capability of MRA to identify stenoses at or above this level allows healthcare providers to make informed decisions regarding diagnosis and treatment planning for vascular diseases.