[Kidney calculi and medullary neoplasms]

Even though we do not find confirmed among our patients the high percentage of 25% of kidneys with medullary carcinoma in lithogenetic patients - this is certainly connected with the fact that our patients are in no way selected - we nevertheless are of the opinion that this picture of a disease should more considered and because of the danger of progression the possibilities of a preventive therapy which are at present at our disposal should increasedly be used.