Ultrasound is a type of imaging examination that can observe the size, shape, structure, texture, and the presence of masses in the organs being examined. It can be used to determine if a patient potentially has kidney-related masses, such as differentiating between a kidney cyst and kidney cancer based on differences in shape and blood supply that malignant tumors typically exhibit compared to other conditions. However, using ultrasound to diagnose kidney cancer can be inaccurate, particularly in the early stages of the disease when ultrasound may not provide a clear view, and some complex cases of kidney cancer may still be indeterminate. Therefore, patients might consider undergoing an enhanced CT scan, which offers a higher diagnostic accuracy. Additionally, a kidney biopsy and pathological examination might be necessary for a definitive diagnosis.