Pathology findings. (A) Section showed infiltration of poorly differentiated tumor cells with atypical hyperchromatic nuclei (H&E stain, 200×). (B) Tumor cells were diffusely positive for CK7 (CK7 stain, 200×). (C) Tumor cells negative for CK20 (CK20 stain, 200×). (D) Tumor cells negative for MUC2 (MUC2 stain, 200×).

Korean J Gastroenterol 2024;84:282~287 https://doi.org/10.4166/kjg.2024.091