Preoperative imaging evaluation for resectable colorectal liver metastasis        ZHONG Yun-shi*, ZENG Meng-su, XU Jian-min. *Institute of General Surgery, Zhongshan Hospital, Fudan University, Shanghai 200032, China.
Corrsponding  author：XU Jian-min，E-mail：xujmin@yahoo.com.cn
Abstract    Over the past two decades, hepatic metastasectomy has emerged as a promising technique for improving survival in patients with metastatic colon cancer and in some cases providing long-term cure. Appropriate preoperative imaging could maximize the safety and efficacy of metastasectomy. Advancements in computed tomography (CT), magnetic resonance imaging (MRI) and positron emission tomography (PET) have led to improved detection of occult lesions and better definition of surgical anatomy. MRI excels at detection of subcentimeter liver metastases compared to CT and FDG-PET. CT may be useful as a screening modality or in preoperative planning such as volumetric estimation of the remnant liver size or in defining preoperative arterial anatomy for hepatic artery infusion pump placement.