Pseudoinvasion in an adenomatous polyp of the colon mimicking invasive colon cancer.
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.
Byun
Tae Jun
TJ
Department of Gastroenterology, Hanyang University College of Medicine, Guri Hospital, Guri, Korea.
Han
Dong Soo
DS
Ahn
Sang Bong
SB
Cho
Hyun Seok
HS
Eun
Chang Soo
CS
Jeon
Yong Cheol
YC
Sohn
Joo Hyun
JH
Oh
Young-Ha
YH