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www.reference.com/article/symptoms-kidney-mass-40fb97b0e1c5e7f0

Most cases of renal masses do not show any symptoms, states the Washington University School of Medicine in St. Louis. Doctors usually find the masses accidentally during a diagnosis for another condition. For example, a patient experiencing abdominal pain may undergo a CT scan that happens to ident

www.reference.com/article/kidney-mass-d5068da56a1f427a

A kidney mass is a growth that arises from inside the kidney, according to Washington University School of Medicine in St. Louis. Most kidney masses are found when a patient is undergoing evaluation for something else and receives an ultrasound or CT scan.

www.reference.com/article/causes-mass-kidney-68bca672ee0903f

It is not clear what causes some types of kidney masses as of July 2015, according to Mayo Clinic. Kidney cysts are fluid-filled masses that form on or in the kidneys. Simple kidney cysts rarely cause complications, but more complex cysts can impair kidney function.

www.reference.com/world-view/common-symptoms-having-mass-kidney-f8bdac324881edcd

Having a mass or tumor on a kidney is often accompanied with other symptoms such as bloody urine, appetite loss, flank pain, weight loss and fatigue, states WebMD.com. It can also cause anemia and swelling in the limbs.

www.reference.com/article/renal-mass-kidneys-c8968d50c842cc5e

A renal mass on the kidneys is a growth that arises from the kidney, according to the Division of Urology at Washington University School of Medicine. The most common renal mass is a cyst, which is a sac filled with fluid arising from the kidney. Cysts rarely cause problems.

www.reference.com/article/surgery-option-remove-kidney-mass-d7c86ed414b619ab

For many physicians, surgery is an option for a kidney mass at clinical stage 1, according to the American Urological Association. At this point, the mass is less than 7 centimeters. About 20 percent of stage 1 masses are benign.

www.reference.com/article/malignant-tumors-e0e90631a282b056

Malignant tumors are cancerous tumors made up of cells that grow fast and often spread throughout the body, according to the American Brain Tumor Association. Malignant tumors are often more invasive than benign tumors. Malignant tumors are often life threatening and require immediate treatment by a

www.reference.com/world-view/difference-between-benign-malignant-tumors-7352ec964f7d324b

According to the National Cancer Institute, the primary difference between benign and malignant tumors is that malignant tumors are cancerous, while benign tumors are not. Only malignant tumors are able to spread to nearby tissue, enter the bloodstream and expand to other areas.

www.reference.com/article/tumor-benign-malignant-22333e94e09043e8

The difference between a benign and malignant tumor is that a benign tumor doesn't metastasize, or spread to distant sites, according to MedlinePlus. Benign tumors can often be removed with surgery. Sometimes, they do not grow back, though tumors such as fibroids tend to recur, explains WebMD.

www.reference.com/article/differences-between-benign-malignant-moles-2dade19a02e42a58

Benign moles often appear during the first decades of life and are characterized as round or regular shaped and brown, reports the Skin Cancer Foundation. On the other hand, melanoma is often irregularly shaped, may not be pigmented and frequently changes in size, color and appearance over time.