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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


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.


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.


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.


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.


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.


Lower left back pain is unlikely to be kidney pain. Kidney pain can be on the left or the right side of the back but is often higher in the back, while lower back pain with no other symptoms is likely to be muscular pain from a back injury, states MedicineNet.


Spine fractures or arthritis, gastrointestinal disease, shingles, muscle spasms or infection of the spine can cause left flank pain near the kidneys, notes MedlinePlus. Problems that cause pain in a single kidney include cancer, tumors, polycystic kidney disease and hydronephrosis, says Mayo Clinic.


Some conditions that can cause pain in the left kidney include kidney stones, polycystic kidney disease, pyelonephritis, hemorrhage, infarction, renal vein thrombosis and cancer, according to the University of Pittsburgh Medical Center. Patients should contact their physician if they experience pain


The most common cause of back pain in the left kidney area is kidney stones, according to Healthline. Other possibilities include a blockage stopping the flow of urine and causing it to back up into the kidneys, inflammation of the kidney and urinary tract, polycystic kidney disease, urinary tract i