Several fluid dark areas in the renal cortex on ultrasound may be associated with renal cysts, renal cortical abscesses or renal tumors. 1. Renal cysts: ultrasound renal cortex several fluid dark area can be seen in renal cysts, which is a common structural abnormality of the kidneys, usually a single common, but can also appear multiple renal cysts, most of them do not have obvious symptoms, usually found during physical examination. 2. Renal cortical abscess: it is a rare kidney infectious disease, and its main symptoms are chills, high fever, lumbar pain, etc. Ultrasound can show several fluid areas in the renal cortex. 3. Renal tumor: ultrasound renal cortex several liquid dark area may also be seen in renal tumor, even malignant tumors. There are no obvious symptoms in the early stage, but in the late stage, there may be waist pain, hematuria, weight loss, etc. If necessary, CT examination of kidney can be perfected to make a clear diagnosis. B ultrasound renal cortex several liquid dark area may also be seen in other diseases, it is recommended that the patient timely consult a doctor, improve the relevant examination, after a clear diagnosis, follow the doctor’s instructions to actively standardize the treatment.