Enhanced CT examination can detect renal cancer. For patients suspected to have renal cancer, enhanced CT scan is routinely needed to find out whether there is arterial enhancement, venous thrombus within the occupying space and whether there is multi-branch blood supply of renal cancer, which is of great significance for judging the nature of the disease and formulating the surgical plan. In particular, if the plain CT scan cannot identify whether it is an occupation within the renal parenchyma or an abnormal protrusion of the kidney, it is routinely necessary to perform enhanced CT scan, which can also determine the relationship between renal cancer and the surrounding tissues and whether there is lymph node metastasis, etc. In principle, enhancement CT scan of the kidney is very important for determining the nature of the disease and formulating the surgical plan. In principle, enhanced CT scan of kidney can basically diagnose renal cancer, but seldom perform puncture biopsy of kidney, because the process of puncture biopsy may cause tumor metastasis along the needle tract, and if enhanced CT confirms the diagnosis of renal cancer, it should be treated by surgery in a timely manner.