阑尾原发性恶性肿瘤少见,仅占肠道肿瘤的0.5%,但很重要,因很少可在术前确诊。共分4型:(1)类癌:半数的类癌起自阑尾,占阑尾切除标本的0.5%,多数在术中偶而发现,多见于年青妇女。约70%的肿瘤位于阑位尖端,小,黄白色,无包膜,仅10%的肿瘤大于2.0cm,固定前要先测量肿瘤的直径,因其大小决定治疗的方案。显微镜所见与肿瘤的恶性程度无关。总5年生存率超过95%。(2)粘液性囊腺癌:患者年龄较腺癌者为小,多有症状,CT 扫描可显示肿瘤,壁有钙化,半数有腹内转移或腹膜假粘液瘤,与粘液性囊腺瘤的主要区别在于阑尾壁有非典型腺体浸润和腹内粘液中存在上皮细胞,因良恶性粘液肿瘤均有不典型细胞、分裂相和乳头状突起。右半结肠切除的 The primary malignant tumor of the appendix is ​​rare, accounting for only 0.5% of the intestinal tumor, but it is very important because it is rarely diagnosed before surgery. There are four types: (1) Carcinoid: Half of the carcinoids originate from the appendix, accounting for 0.5% of appendectomy specimens, and most of them are occasionally found during surgery and are more common in young women. About 70% of the tumors are located at the tip of the iliac crest, small, yellow-white, and non-enveloped. Only 10% of the tumors are larger than 2.0 cm. The diameter of the tumor must be measured before fixation. The size of the tumor determines the treatment plan. Microscopic findings have nothing to do with the degree of malignancy of the tumor. The total 5-year survival rate exceeds 95%. (2) Mucinous cystadenocarcinoma: The patient is younger than the adenocarcinoma and has many symptoms. The CT scan can show the tumor, the wall is calcified, half have intra-abdominal metastasis or peritoneal pseudomyxoma, and the mucinous cystadenoma The main difference is the presence of atypical glandular infiltration in the appendix wall and the presence of epithelial cells in the intra-abdominal mucus, as both benign and malignant mucinous tumors have atypical cells, fissile divisions, and papillary processes. Right colon resection