Renal adenomas are benign tumours found frequently at autopsy - 7 to 22% of patients. They originate in the renal tubules of the cortex and appear as dull yellow, discrete masses. Histologically, they are very similar to a well-differentiated renal cell carcinoma.
Previously, it was thought that small (less than 3cm) solid tumours of the kidney were benign because they rarely metastasized; their histological similarity to renal cell carcinoma now results in similar treatment to their malignant relation i.e. surgical removal.
Last reviewed 01/2018