Renal artery stenosis: imaging options, pitfalls, and concerns

Area of Science:

• Radiology
• Medical Imaging
• Cardiovascular Imaging

Background:

• Renal artery stenosis (RAS) diagnosis relies on multiple imaging modalities.
• Each modality presents unique trade-offs between risk, accuracy, and cost.
• Catheter angiography is the gold standard but highly invasive.

Purpose of the Study:

• To review and compare various imaging techniques for diagnosing renal artery stenosis.
• To highlight advancements in magnetic resonance angiography (MRA) for RAS.
• To discuss the risk-benefit profiles of different diagnostic approaches.

Main Methods:

• Review of existing literature on imaging modalities for renal artery stenosis.
• Comparison of ultrasonography, CT angiography, MR angiography, and catheter angiography.
• Discussion of novel contrast agents and non-contrast MRA techniques.

Main Results:

• Ultrasonography is safe and inexpensive but less accurate and operator-dependent.
• Contrast-enhanced CT and MR angiography offer intermediate accuracy and cost.
• New MRA techniques, including contrast-enhanced and non-contrast options, are improving accuracy and safety, mitigating risks like nephrogenic systemic fibrosis.

Conclusions:

• Magnetic resonance angiography is emerging as a powerful tool for diagnosing renal artery stenosis.
• Advancements in MRA provide safer and more accurate diagnostic options.
• The choice of imaging modality should balance diagnostic needs with patient risk and cost.