Hematuria, pain, and lumps are the main symptoms of kidney cancer. If one or two of these symptoms appear, the possibility of kidney cancer should be considered. About half of the patients are found to have incidental kidney cancers, also known as asymptomatic kidney cancers, during physical examinations through incidental findings on ultrasound or CT scans. Some may show early symptoms of metastasis making the diagnosis quite challenging. The preoperative diagnosis of kidney cancer relies on the results of medical imaging examinations such as ultrasound, X-rays, and CT scans. CT scans have a very high confirmation rate for kidney cancer and are currently the most reliable imaging method for diagnosing kidney cancer.