Pseudoinvasion and squamous metaplasia/morules in colorectal adenomatous polyp: a case report and literature review.

ABSTRACT:

Background

Submucosal pseudoinvasion and squamous metaplasia (SM) are incidental and special morphological findings in colorectal adenomas, and both can mimic invasive carcinoma. The coexistence of these two findings further increases the risk of misdiagnosis, posing a great diagnostic challenge to pathologists. From 1979 to 2022, only 8 cases have been reported, which was extremely rare. In this report, we presented a case of sigmoid colon adenoma accompanied by pseudoinvasion and SM. Additionally, relevant literature was analyzed to summarize the clinical and pathological characteristics.

Case presentation

A 51-year-old Chinese male patient presented with fresh blood after defecation. Electronic colonoscopy revealed multiple polyps, which were removed using a snare and sub

SUBMITTER: Shi L 

PROVIDER: S-EPMC11406912 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature