Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Gut Liver. 2009 Jun;3(2):130-3. doi: 10.5009/gnl.2009.3.2.130. Epub 2009 Jun 30.

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

Author information

  • 1Department of Gastroenterology, Hanyang University College of Medicine, Guri Hospital, Guri, Korea.

Abstract

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.

KEYWORDS:

Adenomatous polyps; EUS; Malignant polyp; Pseudoinvasion

PMID:
20431736
[PubMed]
PMCID:
PMC2852693
Free PMC Article

Images from this publication.See all images (4)Free text

Fig. 1
Fig. 2
Fig. 3
Fig. 4
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Inforang Icon for PubMed Central
    Loading ...
    Write to the Help Desk