Distinguishing Hepatocellular Carcinoma from Cirrhotic Regenerative Nodules Using MR Cytometry

Area of Science:

• Hepatobiliary imaging
• Biomarker discovery
• Medical physics

Background:

• Current diagnostic guidelines for hepatocellular carcinoma (HCC) rely on contrast-enhanced CT/MRI, which often struggle to distinguish HCC from benign nodules in cirrhotic livers.
• This diagnostic ambiguity leads to delayed treatment due to the need for invasive biopsies or prolonged surveillance imaging.
• There is a critical need for noninvasive imaging biomarkers to accurately identify HCC.

Purpose of the Study:

• To develop noninvasive imaging biomarkers of liver cell size and cellularity using magnetic resonance imaging (MRI).
• To evaluate the utility of these biomarkers in differentiating hepatocellular carcinoma (HCC) from benign liver lesions.

Main Methods:

• MR cytometry was employed, measuring water diffusion rates to probe cellular microstructure at various scales.
• A three-compartment model of the MRI signal was used to derive maps of cell size and cellularity.
• The method was validated using histology-driven simulations and ex vivo MR cytometry on fixed human liver specimens.

Main Results:

• Both simulations and ex vivo experiments demonstrated that HCC exhibits significantly smaller cell sizes compared to normal liver and cirrhotic regenerative nodules.
• Higher cellularity was observed in HCC in comparison to normal and cirrhotic liver tissues.
• MR cytometry effectively quantified these microstructural differences.

Conclusions:

• MR cytometry shows significant potential for differentiating HCC from non-HCC lesions by quantifying cell size and cellularity.
• These findings establish a foundation for further research into MR cytometry's role in the noninvasive early diagnosis of HCC.
• This approach could reduce the need for invasive procedures and expedite treatment initiation.