左侧为正常鳞状上皮，右侧为高分化鳞状细胞癌(向深部组织浸润)。肿瘤的鳞状细胞与正常的鳞状细胞结构相似，但排列紊乱。

鳞状细胞癌:高分化 | 角化珠 | 中分化 | 核分裂 | 桥粒(电镜)

The normal squamous epithelium at the left merges into the squamous cell carcinoma at the right, which is infiltrating downward. The neoplastic squamous cells are still similar to the normal squamous cells, but are less orderly. This is a well-differentiated squamous cell carcinoma.