If a nodule is found on the top of the kidney, it is important to conduct a detailed examination to accurately test whether the nodule on the kidney is cystic or substantial. In most cases, cystic nodules are mostly benign diseases such as kidney cysts. In contrast, substantial lesions require further examination. Nowadays, genitourinary tumors are becoming more and more common in urology, and most of the current kidney tumor conditions are malignant. Therefore, once a nodular lesion is found in the kidney, detailed ultrasound, CT and MRI should be examined, and angiography is also needed to help clarify the diagnosis. b ultrasound can already detect tumors of about one centimeter in diameter inside the kidney, and can determine the nature of the nodule. ct and MRI are important for diagnosing whether a kidney nodule is a tumor, and can clearly stage and understand the location of the invasion of the kidney. The location of invasion of the kidney lesion. For the diagnosis of difficult cases, angiography can be performed to clarify the vascular thickening and disorder of the nodule or the occupying lesion, which can suggest the possibility of tumor. In addition, the diagnosis can also be made by the combination of symptoms. One third of patients with cancerous kidney lesions will find the typical triad of enlarged kidney, hematuria, pain and mass. Therefore, once a nodule is found on the kidney, it must be examined in detail to exclude the possibility of cancer.