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Updated: Nov 6, 2025

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Endoscopically unobservable appendiceal adenoma treated using laparoscopically assisted surgery.

Tomohiro Kurokawa1, Yoshiaki Kanemoto1, Yuki Azuma1

  • 1Department of Surgery, IMSUT Hospital, The Institute of Medical Science, The University of Tokyo, Japan.

International Journal of Surgery Case Reports
|May 11, 2021
PubMed
Summary

Benign appendiceal adenomas are rare. This case highlights that appendiceal tumors may spontaneously resolve, emphasizing careful timing for diagnosis and treatment of these rare appendix polyps.

Keywords:
Atypical tubular adenomaBenign adenomaCase reportLaparoscopically assisted appendectomyPrimary appendix

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Area of Science:

  • Gastroenterology
  • Surgical Oncology

Background:

  • Primary benign adenomas of the appendix are rare, occurring in approximately 0.02-0.08% of cases.
  • Appendiceal adenomas are sporadically reported in appendectomy and autopsy findings.

Purpose of the Study:

  • To report a unique case of a disappearing appendiceal adenoma.
  • To discuss the diagnostic and therapeutic challenges of appendiceal adenomas.

Main Methods:

  • A 58-year-old woman presented with a polyp in the appendiceal orifice identified during lower gastrointestinal endoscopy.
  • The polyp was not found during a subsequent endoscopy, leading to an appendectomy for diagnosis and treatment.
  • Pathological examination revealed a low-grade atypical tubular adenoma without malignancy.

Main Results:

  • The appendiceal polyp was initially observed but subsequently disappeared before surgical intervention.
  • Appendectomy confirmed a benign tubular adenoma, with no signs of malignancy.
  • Laparoscopic appendectomy was performed, proving to be a safe and curative option.

Conclusions:

  • Appendiceal adenomas can exhibit spontaneous resolution, influenced by examination and treatment timing.
  • Surgical resection, including laparoscopic approaches, remains the standard treatment for appendiceal adenomas due to perforation risks.
  • Patients undergoing appendectomy for adenoma should be counseled on potential cancer risks and the need for further management.