Application of CT and MRI in the diagnosis of retroperitoneal tumor        YANG Li, XING Ning. Department of Radiology, PLA General Hospital, Beijing 100853, China
Corresponding author: YANG Li, E-mail:yangli301@yahoo.com
Abstract    Located deeply and having no symptoms in early stage, the retroperitoneal neoplasm can be detected more often on the abdominal study with ultrasound for the routine healthy care. The definition of tumor location and property depends on the cross-imaging, such as CT and MRI imaging. Clinically, the CT is the fist choice modality for its high spatial resolution and more powerful ability with 3D imaging technique. Enhanced CT and CT reconstruction technique are necessary for the definite diagnosis. The characteristics of tumor and tumor adjacent structure are key points for the definition of tumor location, property and discovery of the involving of the vessels and organs.