Submucosal micropapillary adenocarcinoma of the sigmoid colon: A distinct and aggressive subtype of adenocarcinoma.

Colorectal invasive micropapillary carcinoma (MPC) is a rare and distinct variant of adenocarcinoma with high incidence of lymph node metastasis. The differential diagnoses of MPC include extensive lymphovascular invasion, metastatic MPC, and retraction artifacts.