The typical clinical manifestations of renal cancer are hematuria, a mass, and flank pain, but these symptoms generally appear only in the middle and late stages. CT scans often play a decisive role in the diagnosis of renal cancer. Ultrasound examinations are mainly used to screen for the presence of tumors in the entire urinary system, while excretory urography can reveal compression inside the renal pelvis by the tumor, which may show irregular deformations, narrowing, or elongation. Generally speaking, CT scans are quite important for the diagnosis of renal cancer and also play a decisive role.