Imaging-based diagnosis of autosomal dominant polycystic kidney disease

Area of Science:

• Nephrology
• Radiology
• Medical Genetics

Background:

• Conventional ultrasonography (US) has limited diagnostic sensitivity for autosomal dominant polycystic kidney disease (ADPKD), particularly in younger at-risk individuals.
• Early and accurate ADPKD diagnosis is crucial for timely management and intervention.

Purpose of the Study:

• To compare the diagnostic performance of MRI and high-resolution (HR) US against molecular testing in at-risk individuals for ADPKD.
• To evaluate the sensitivity and specificity of these imaging modalities in diagnosing ADPKD.

Main Methods:

• A prospective, single-center study involving 126 at-risk individuals (ages 16-40) and 45 healthy controls.
• Participants underwent both MRI and HR US, followed by PKD1 and PKD2 mutation screening.
• Diagnostic criteria included >10 cysts for those under 30 and adjusted criteria for older subjects.

Main Results:

• MRI demonstrated 100% sensitivity and specificity for ADPKD diagnosis in individuals under 30.
• HR US showed improved sensitivity (~97%) compared to conventional US (~82%), with slightly decreased specificity (~98% vs. 100%).
• Similar high diagnostic performance was observed in the 30-40 age group for both MRI and HR US.

Conclusions:

• MRI is a highly sensitive and specific tool for diagnosing ADPKD in at-risk populations.
• HR US shows potential to match MRI's diagnostic performance, though it is subject to center- and operator-dependency.
• These advanced imaging techniques improve ADPKD detection, especially in younger individuals where conventional US is less effective.