"Skip areas" in hepatic steatosis: a sonographic-angiographic study

Area of Science:

• Hepatology
• Radiology
• Vascular Anatomy

Background:

• Focal steatosis is a common liver condition characterized by localized fat accumulation.
• The classic understanding involves lobar or segmental patterns of fatty infiltration.
• A newly proposed subsegmental type, featuring "skip areas," requires further characterization.

Purpose of the Study:

• To describe the characteristics of the subsegmental type of focal steatosis.
• To investigate the topographical distribution of "skip areas."
• To correlate the topography of skip areas with underlying vascular anatomy.

Main Methods:

• In vivo ultrasound observations.
• Postmortem in vitro angiogram analysis.
• Correlation of imaging findings with vascular patterns.

Main Results:

• The subsegmental type of focal steatosis exhibits homogeneous fatty infiltration except for "skip areas."
• "Skip areas" are typically found in subcapsular regions, along interlobar fissures, or near the gallbladder bed.
• The extent and location of these skip areas are linked to local vascular anatomy variations.

Conclusions:

• The subsegmental type of focal steatosis is a distinct entity characterized by specific skip area patterns.
• Vascular anatomy plays a crucial role in determining the distribution of these skip areas.
• Understanding these patterns aids in differentiating focal steatosis subtypes and their potential causes.