PMC9395918_01
Microscopic features. The main body of the tumor was located in the muscularis and subserosa of the colonic wall (A, x6). At high magnification, the tumor morphology appeared as a nest-like and organ-like structure (Zellballen pattern) (B, x200). Lymph-node metastasis (C, x20; D, x100).
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PMC9395918_01_fsurg-09-961514-g001.jpg
F1
The maximum diameter of tumor and metastatic lymph nodes decreased after neoadjuvant chemotherapy (Supplementary Figure S1). The tumor cells showed abundant cytoplasm, obvious nuclear atypia, and had a mitotic figure of <1 per 10 high-power fields.