Contrast-Enhanced Ultrasonography in Renal Evaluation

Contrast-enhanced ultrasonography (CEUS) has emerged as a pivotal imaging modality for non-invasive assessment of renal structure and function. By employing microbubble-based contrast agents, CEUS enables real-time visualisation of cortical and medullary perfusion without the nephrotoxicity associated with iodinated or gadolinium-based media. This technique enhances the detection of focal lesions, cortical necrosis and vascular complications in native kidneys and allografts. Quantitative analysis of time-intensity curves provides metrics such as peak enhancement and time to peak, reflecting microcirculatory dynamics. CEUS can be performed at the bedside, offering dynamic assessment in critically ill patients, and is adaptable to paediatric and adult populations alike. Its high temporal resolution facilitates distinction between renal vein thrombosis, cortical necrosis and other causes of acute kidney injury, while serial evaluations support monitoring of chronic renal insufficiency and therapeutic interventions.

Research from Nature Portfolio

Recent studies have demonstrated the capacity of CEUS to characterise rare patterns of acute kidney injury. In particular, multiparametric ultrasound investigations of cortical necrosis have identified a distinctive reverse rim sign, in which delayed wash-in and non-enhancing subcapsular zones delineate necrotic cortex. Dynamic assessment revealed consistent resistance index values below unity and highlighted the utility of CEUS in differentiating cortical necrosis from renal vein thrombosis through medullary enhancement patterns. These findings underscore the role of CEUS in rapid bedside diagnosis of life-threatening renal conditions and in guiding clinical management without exposing patients to nephrotoxic agents.

Contrast-Enhanced Ultrasonography in Renal Evaluation publication trend

The graph below shows the total number of articles in contrast-enhanced ultrasonography in renal evaluation across all publications each year (not limited to Nature Index journals).

Technical terms

Contrast-Enhanced Ultrasonography (CEUS): An ultrasound technique using microbubble contrast agents to visualise blood flow and tissue perfusion in real time.

Microbubble Contrast Agent: Gas-filled microspheres that enhance ultrasound backscatter, permitting dynamic assessment of vascular and microvascular flow.

Time-Intensity Curve (TIC): A graphical representation of contrast enhancement over time, used to derive quantitative perfusion parameters.

Reverse Rim Sign: An imaging pattern in which the subcapsular cortex remains unenhanced relative to inner cortex, indicative of cortical necrosis.

Resistance Index (RI): A Doppler-derived measure of vascular impedance, calculated from peak systolic and end-diastolic velocities, reflecting arterial resistance.

References

1. The Usefulness of Contrast-Enhanced Ultrasound in the Assessment of Early Kidney Transplant Function and Complications. Diagnostics (2017).
2. Multiparametric ultrasound findings in acute kidney failure due to rare renal cortical necrosis. Scientific Reports (2021).
3. Feasibility of contrast-enhanced ultrasonography (CEUS) in evaluating renal microvascular perfusion in pediatric patients. BMC Medical Imaging (2022).
4. Contrast-enhanced ultrasonography for assessing histopathology in pediatric immunoglobulin A nephropathy and Henoch–Schönlein purpura nephritis. Pediatric Radiology (2022).