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    Area of Science:

    • Gastroenterology
    • Medical Imaging
    • Anatomy

    Background:

    • Accurate characterization of colon and rectum wall layers is crucial for staging and managing colonic lesions.
    • Endoscopic ultrasonography (EUS) offers high-resolution imaging of the gastrointestinal tract.

    Purpose of the Study:

    • To characterize the colon and rectum walls, including pericolic and perirectal spaces, using endoscopic ultrasonography miniprobes.
    • To compare the efficacy of 12 MHz and 20 MHz miniprobes in visualizing these structures.

    Main Methods:

    • Sixty individuals underwent evaluation using 12 MHz and 20 MHz EUS miniprobes.
    • All colon segments (ascending, transverse, descending, sigmoid) and the rectum were assessed.
    • Evaluated parameters included the number and thickness of intestinal wall layers, submucosal vessels, and peri-intestinal lymph nodes.

    Main Results:

    • The 20 MHz miniprobe identified significantly more layers (median 7) than the 12 MHz probe (median 5).
    • The rectal wall (including muscularis propria and mucosa) was significantly thicker than all colon segments.
    • Individuals aged 41-60 showed thicker colonic walls, particularly in the descending colon and rectum.

    Conclusions:

    • Higher EUS frequencies enhance the visualization of intestinal wall layers.
    • The rectal wall is consistently thicker than the colon wall.
    • Peri-intestinal adenopathies were infrequently observed in asymptomatic individuals, providing baseline data for staging colonic lesions.