2020年版WHO肛管肿瘤组织学分类

a.    Intraepithelial tumor/precursors上皮内肿瘤/前驱病变

                                          i.    Squamous intraepithelial neoplasia, low grade

鳞状上皮内瘤变，低级别

                                         ii.    Squamous intraepithelial neoplasia, high-grade

鳞状上皮内瘤变，高级别

b.    Malignant epithelial tumors恶性上皮性肿瘤

                                          i.    Squamous cell carcinoma鳞状细胞癌

1.    Verrucous squamous cell carcinoma

疣状鳞状细胞癌

                                         ii.    Adenocarcinoma

腺癌

                                        iii.    Neuroendocrine tumor神经内分泌肿瘤

1.    Neuroendocrine tumor, grade 1

神经内分泌肿瘤，G1级

2.    Neuroendocrine tumor, grade 2

神经内分泌肿瘤，G2级

3.    Neuroendocrine tumor, grade 3

神经内分泌肿瘤，G3级

                                       iv.    Neuroendocrine carcinoma神经内分泌癌

1.    Large cell neuroendocrine carcinoma

大细胞神经内分泌癌

2.    Small cell neuroendocrine carcinoma

小细胞神经内分泌癌

                                        v.    Mixed neuroendocrine–non-–neuroendocrine neoplasm (MiNEN)

混合性神经内分泌-非神经内分泌肿瘤