What Does a CT Scan Show in Kidney Cancer?

A CT scan (computed tomography) is one of the most important tools used to detect, confirm, and assess kidney cancer. It provides detailed, cross-sectional images of the kidneys and surrounding areas, making it more accurate than a standard ultrasound when evaluating a kidney mass.

A CT scan can show:

  • The size and location of a kidney tumor
  • Whether the tumor is solid or cystic
  • If the cancer has spread to nearby tissues, blood vessels, lymph nodes, or other organs
  • Changes in both kidneys, helping to detect tumors on both sides
  • Blockages in the urinary tract

Doctors often use a contrast-enhanced CT scan, where a special dye is injected into a vein before the scan. This dye helps highlight blood vessels and the internal structure of the kidneys, allowing for clearer images and better detection of abnormal growths.

CT scans are not only useful for diagnosing kidney cancer, but also for staging the disease. Staging refers to determining how far the cancer has spread, which is essential for choosing the best treatment approach—whether surgery, active surveillance, or medication.

If surgery is being considered, a CT scan helps map the anatomy of the kidneys and nearby blood vessels, ensuring a safer and more precise operation. For people already diagnosed, CT scans may also be used to monitor for recurrence during follow-up visits.

Although CT scans involve exposure to radiation and sometimes contrast dye, the benefits far outweigh the risks when kidney cancer is suspected or confirmed.

Looking for more questions?

Visit our Kidney Cancer Questions page for all other topics explained in plain language.

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