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经过外科治疗而存活的消化道肿瘤患者中有一定数量的病人发生肝转移癌。Cedermark等报告456例大肠癌死亡病例的尸检中,48%存在肝转移。最近Finlay等报告彻底切除的结肠直肠癌患者中有30%发生肝转移,大多数肝转移发生在术后一年内。从上数字可以看出进行手术的病人中约有30%存在微小的肝转移癌,而这些微小的肝转移癌用现有的各种检查方法均不能发现。超声扫描和静态同位素影象检查对直径小于1～2cm转移癌的诊断不敏感,Fin-lay等认为CT虽然在准备手术的病人中最终发现了30%转移癌,但是诊断往往要耽误几个月和需要
Liver metastatic carcinoma occurs in a certain number of patients who have survived gastrointestinal cancer after surgical treatment. Cedermark et al. reported 456 autopsy cases of death from colorectal cancer, 48% had liver metastases. Recently, Finlay et al reported that 30% of colorectal cancer patients who had undergone radical resection had liver metastases, and most liver metastases occurred within one year after surgery. From the above figures, it can be seen that about 30% of the patients undergoing surgery have microscopic liver metastases, and these microscopic liver metastases cannot be found using any of the existing examination methods. Ultrasound scans and static isotope imaging examinations are insensitive to the diagnosis of metastatic carcinomas less than 1 to 2 cm in diameter. Fin-lay et al. believe that although CT may eventually find 30% of metastatic carcinomas in patients undergoing surgery, the diagnosis often takes several months. And need