类癌是肠嗜铬系统的恶性病变,主要发生在回肠和空肠,常可伴有肝内广泛转移,并在此基础上产生一些足以引起症状的体液性因子,如5羟色胺(血清素)、缓激肽、组织胺、前列腺素等,从而引起阵发性潮红(阵红)、毛细血管扩张、肠蠕动亢进和腹泻,三尖瓣或肺动脉瓣狭窄或/和关闭不全,右心衰竭、支气管哮喘等特殊表现,既然是肿瘤,必然可有占位性病变所 Carcinoids are malignant lesions of the intestinal chromaffin system, occurring mainly in the ileum and jejunum, and are often associated with extensive metastases in the liver, and on this basis produce a number of humoral factors sufficient to cause symptoms, such as serotonin (serotonin), Bradykinin, histamine, prostaglandins, etc., causing paroxysmal flushing (redness), telangiectasia, hypermotility and diarrhea, tricuspid or pulmonary stenosis or/and insufficiency, right heart failure, bronchial Asthma and other special performance, since it is a tumor, there must be space-occupying lesions