A mass on the kidney can take the form of a cyst, in which case it is generally filled with fluid and may contain some detritus, or it can be a solid growth. Benign tumors do sometimes occur in the kidneys, but a solid growth is more commonly a sign of a malignancy which should be addressed. If the imaging study suggests that the mass is solid, a doctor may recommend a biopsy to take a sample of the mass for analysis in a pathology laboratory. The analysis can be used to determine which kinds of cells are involved in the mass.If you have the Symptoms of Renal Cyst--Renal mass, we would say herbal medicine is a safe and effective form of treatment. At TCM Window, we offer relaxing treatments and expert guidance through the whole process. We specialize in different kinds of chronic and difficult miscellaneous diseases, we offer the best possible care in a peaceful and welcoming environment. If you would want our expert to create a TCM diagnosis, please fill out the health form as requested.