大肠的上皮性肿瘤按其增殖、扩展的方式可大致分为向内腔突出的隆起型和以同心圆状向水平万向扩展的表面型。以往诊断的大部分大肠肿瘤为隆起型,展的表面型。以往诊断的大部分大肠肿瘤为隆起型,但近年来,诊断为表面型肿瘤的病例却不断增加,其中大部分是腺瘤,而并非癌。有关腺瘤尚有许多争议之处,本文主要就表面型大肠癌的定义、诊断及临床病理学特征等做一论述。一、表面型肿瘤的定义肿瘤性腺管以水平方向发育扩展而形成的肿瘤,瘤体高度与腺管长度一致。其高度即使较正常粘膜略 Epithelial tumors of the large intestine can be roughly divided into a bulging type that protrudes toward the inner cavity and a surface type that expands concentrically toward the horizontal direction in accordance with the manner of its proliferation and expansion. Most of the large intestine tumors diagnosed in the past were bulging type and surface type. Most of the large intestine tumours diagnosed in the past were bulging, but in recent years, the number of cases diagnosed as superficial tumours has been increasing, and most of them are adenomas, not cancers. There are still many controversial adenomas. This article mainly discusses the definition, diagnosis and clinical pathological features of surface colorectal cancer. First, the definition of surface tumor Tumor glands developed in the horizontal direction and the formation of tumors, tumor height and gland length consistent. Its height is slightly more than normal mucosa