Renal cell carcinoma (renal cancer for short) is a tumor of higher malignancy in the urinary system and one of the most common tumors, accounting for 80% to 90% of renal malignant tumors. According to the survey, kidney cancer occupies the second place among genitourinary tumors in China, second only to bladder tumors. Kidney cancer can occur in people of any age, and epidemiological survey studies have found that the incidence of kidney cancer increases with age. However, because the process of kidney urinary tubule cell carcinogenesis usually takes more than a decade or even decades, most of the people affected by kidney cancer are concentrated in middle-aged and elderly people, with the high incidence age between 50 and 70 years old. However, it can also occur in younger or older age groups. Because the early symptoms of kidney cancer are not obvious, there are no typical symptoms such as hematuria and back pain, until the tumor grows very large, the “triad of symptoms” – hematuria, pain and lump – will appear, and it is also relatively late to be detected, so the symptoms of early kidney cancer are light and generally not easy to be detected. Therefore, the symptoms of early kidney cancer are relatively mild and less likely to be detected. Therefore, regular medical checkups are very important for early detection of kidney cancer. Nowadays, the resolution of ultrasound is relatively high, and lesions with a diameter of about 0.5cm can be detected. Therefore, ultrasound examination of both kidneys should be performed at least once a year, and for those who are in the age of 40-60, which is the age of high incidence of kidney cancer, they should pay more attention to routine ultrasound examination.