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Small invasive colonic cancer occurring in a hyperplastic polyp.

T Kudo1, T Matsumoto, M Esaki

  • 1Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka 812-8582, Japan. t-kudo@intmed2.med.kyushu-u.ac.jp

Endoscopy
|August 25, 2004
PubMed
Summary

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This case study highlights advanced colon cancer originating from a hyperplastic polyp, a rare occurrence. It suggests nonpolypoid cancers may develop from hyperplastic polyps, challenging previous assumptions.

Area of Science:

  • Gastroenterology
  • Oncology
  • Pathology

Background:

  • Hyperplastic polyps are generally considered benign and non-neoplastic.
  • The potential for hyperplastic polyps to undergo malignant transformation is a topic of ongoing research and debate.
  • Few cases report the preoperative diagnosis of colon cancer arising within a hyperplastic polyp.

Observation:

  • A 68-year-old man presented with advanced colon cancer suspected to originate from a hyperplastic polyp.
  • Colonoscopy revealed a depressed lesion with surrounding elevated mucosa; dye spraying and magnifying colonoscopy showed specific patterns suggesting cancer within a hyperplastic polyp.
  • Endoscopic ultrasonography indicated deep submucosal invasion, necessitating surgical intervention.

Findings:

  • Laparoscopically assisted right hemicolectomy confirmed a well-differentiated adenocarcinoma invading the muscularis propria.

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  • The surrounding lesion was identified as hyperplastic mucosa, with no adenomatous components found.
  • This represents a rare instance of a preoperative diagnosis of carcinoma in a hyperplastic polyp.

    • Implications:

    • This case supports the emerging consideration of hyperplastic polyps as a potential precursor to colon cancer.
    • It underscores the possibility of nonpolypoid colon cancer developing from hyperplastic polyps.
    • Further research is warranted to understand the mechanisms and frequency of carcinogenesis from hyperplastic polyps.