Intramucosal colorectal carcinoma with lymphovascular invasion: clinicopathological characteristics of nine cases.

In intramucosal CRCs with lymphovascular invasion, high-grade tumour budding and the 'ERI' pattern are morphological characteristics that are distinct from those of non-invasive CRC, which is synonymous with high-grade dysplasia. Further studies using a larger number of cases by focusing on the above-mentioned histological pattern are expected to clarify the potential of lymph node metastasis of such cases.