Undetected Anal and Anorectal Tumors in Endoscopic Assessments: A Retrospective Analysis Over Ten Years - Takeaways - MDSpire

Undetected Anal and Anorectal Tumors in Endoscopic Assessments: A Retrospective Analysis Over Ten Years

  • By

  • Zhu-Jun Wu

  • Hui Gong

  • Ya-Xin Li

  • Yuan Li

  • Wei-Yi Wu

  • Lin-Jie Guo

  • February 6, 2026

  • 0 min

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  • 1

    Approximately 12% of anal and anorectal tumors were missed during colonoscopy, resulting in delayed diagnoses.

  • 2

    Missed diagnoses may stem from inadequate visualization, unfamiliarity with tumor features, and false-negative biopsy results.

  • 3

    The study analyzed patients diagnosed with anal and anorectal tumors at West China Hospital from 2014 to 2024.

  • 4

    Causes of missed tumors were categorized into exposure errors, judgment errors, biopsy errors, and unclassified errors.

  • 5

    Standardizing examination procedures and improving endoscopists' knowledge may reduce the rate of missed anal and anorectal tumors.

Original Source(s)

Undetected Anal and Anorectal Tumors in Endoscopic Assessments: A Retrospective Analysis Over Ten Years

  • by Zhu-Jun Wu, Hui Gong, Ya-Xin Li, Yuan Li, Wei-Yi Wu, Lin-Jie Guo

  • February 6, 2026

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