Typical manifestations of renal cancer in B-ultrasound examination

B-ultrasound examination of kidney cancer is simple and easy, and does not cause pain or trauma to the examinee. In B-ultrasound images, typical kidney cancer may have the following manifestations. 1. Changes in kidney contour: When the tumor is small, the kidney contour may not change significantly. Larger tumors protrude toward the kidney surface, causing the kidney contour to increase in a limited manner and become uneven. The kidney's appearance loses its normal state. The boundary between the tumor and the surrounding tissue is relatively clear. However, when advanced kidney cancer infiltrates the surrounding tissue extensively, the boundary is often unclear.

2. Abnormal echo of renal parenchyma: Abnormal echo masses appear in the renal parenchyma, which are round or oval in shape, with clear boundaries and a sense of sphere. The internal echo varies. Most medium-sized tumors are low-echoic, and only a few are mixed echoes or equal echoes of varying strengths. When there is bleeding, necrosis or liquefaction inside a larger tumor, an irregularly edged anechoic area is locally displayed. If there is calcification, it will appear as a point or block of strong echoes with acoustic shadows. Smaller renal cancer sometimes appears as a high-echo mass.

3. The echo of the renal sinus is compressed and deformed: When the tumor grows inward and compresses or invades the renal sinus, the renal sinus may become concave, displaced, interrupted, or even unclear. In a few cases, the renal pelvis and calyx may dilate and accumulate water.

4. Abnormal changes in blood vessels around the kidney: In the late stage of renal cancer, when the cancer tissue invades or metastasizes through the blood to the renal vein and lower limb veins, the ipsilateral renal vein or inferior vena cava will widen and become blocked, with irregular low- and medium-level dot- or mass-like echoes inside.

5. Signs of renal cancer metastasis: abnormal mass-like low-echo in organs such as the renal hilum, retroperitoneal lymph nodes, liver, adrenal glands and contralateral kidney.