Hello, the renal mass may be one of the types of kidney cancer or a non-malignant growth. For smaller kidney
masses (those less than 4 cm) up to 20% or 30% of these masses may be a non-malignant growth. These masses are
usually classified as oncocytomas, angiomyolipomas, complex cyst or a number of other less common growth
types. Larger kidney masses (greater than 7cm) are more commonly a type of kidney cancer. Over 90% of these
growths are malignant in nature.Malignant or non malignant nature of the mass will be confirmed by biopsy.Hope
this helps and take care.