What are the benign renal tumors?

Types of benign kidney tumors include: Renal adenoma – Renal adenomas are the most common form of benign, solid kidney tumor, and are typically small, low-grade growths. Their cause is unknown. Renal oncocytoma – Oncocytoma is a benign, usually asymptomatic tumor that can grow quite large.

Are most masses of the kidney benign?

Although most kidney tumors are malignant and therefore cancerous, up to 20% are benign. Benign tumors do not spread to other parts of the body. Having no signs of spreading is important for deciding what treatments might be best for the tumor.

What percentage of renal masses are benign?

About 20-30% of “suspicious” kidney tumors when removed prove to be benign! These benign growths include cysts, oncocytomas, angiomyolipomas, and mixed epithelial stromal tumors. Thus, 70-80% of these “small” kidney tumors are cancers and fortunately the majority are “well behaved” (low grade) cancers.

What is the most common benign solid renal tumor?

Angiomyolipoma. Angiomyolipoma is one of the most common benign solid renal neoplasms (1). AML is composed of blood vessels, smooth muscle, and adipose tissue (9). It occurs most often in the 4-6th decades, with preponderance in women (10).

What are the signs of a renal mass?


  • Hematuria (blood in urine)
  • Flank pain between the ribs and hips.
  • Low back pain on one side (not caused by injury) and that does not go away.
  • Loss of appetite.
  • Weight loss not caused by dieting.
  • Fever not caused by an infection and that does not go away.
  • Anemia (low red blood cell count)

Can renal mass be cured?

Because advanced kidney cancer is very hard to cure, clinical trials of new combinations of targeted therapies, immunotherapy, or other new treatments are also options. For some people, palliative treatments such as radiation therapy may be the best option.

What would cause a mass on the kidney?

There is no known cause for developing a kidney mass. But there are a number of things that can increase your risk for kidney tumors such as: Smoking. Obesity, poor diet.

What are the common renal masses?

The common renal masses are hydronephrosis and multicystic dysplastic kidney . Rarer renal masses include autosomal recessive polycystic disease, mesoblastic nephroma, renal vein thrombosis, and nephroblastomatosis.

What are the symptoms of a benign tumor in the kidney?

In many cases, benign and cancerous kidney masses will not produce any symptoms. Instead, the masses are often discovered by accident while doing an imaging test for an unrelated reason. Some common symptoms that may present, however, include back pain, fatigue, and a touchable lump in the region of the kidneys.

What is a renal mass and what is a localized renal tumor?

The words “tumor” and “mass” mean abnormal growths in the body. A renal mass, or tumor, is an abnormal growth in the kidney. Some renal masses are benign (not cancerous) and some are malignant (cancerous). One in four renal masses are benign. Smaller masses are more likely to be benign.

Do all benign tumors require surgery?

Not all spinal tumors require immediate surgical treatment. Sometimes the tumor is observed over time for change. This is a common approach in small benign (non-cancerous) tumors. Larger benign tumors, certain types of spine cancer (malignant), and progressive tumors may require surgical intervention.