Pseudoinvasion in an adenomatous polyp of the colon mimicking invasive colon cancer

Jun Byun Tae, Soo Han Dong, Bong Ahn Sang, Seok Cho Hyun, Soo Eun Chang, Cheol Jeon Yong, Hyun Sohn Joo, Young Ha Oh

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10 Scopus citations


Pseudoinvasion or pseudocarcinomatous invasion in an adenomatous polyp of the colon can be unfamiliar to an endoscopist. Pseudoinvasion in an adenomatous polyp represents prolapse of the adenomatous epithelium into its stalk. In most cases its morphology does not differ from of general adenomatous polyps, but in some cases it can morphologically mimic a malignant polyp with submucosal invasion due to mass-like lesioning of its stalk. This makes it difficult for endoscopists to differentiate pseudoinvasion in an adenoma from an invasive carcinoma by conventional endoscopy; instead, endoscopic ultrasonography can provide useful information for differentiating these conditions. We report on an 82-year-old man who presented with a large pedunculated polyp with a thick stalk in the sigmoid colon, which mimicked a submucosal invasive carcinoma. The patient was diagnosed with pseudoinvasion in an adenomatous polyp after segmental resection of the sigmoid colon.

Original languageEnglish
Pages (from-to)130-133
Number of pages4
JournalGut and Liver
Issue number2
StatePublished - 2009 Jun 1


  • Adenomatous polyps
  • EUS
  • Malignant polyp
  • Pseudoinvasion

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