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The renal cancer (RC) cystic component is on the radiological tests and could be consolidate with pathological analysis. The concepts "cystic renal cancer" or "cystic renal tumor" contain a group of entities range from cystic grown pattern RCs to pseudocystic tumors as well as cystic renal diseases coinciding with the RC. The CR and the cystic renal diseases have a great variety to sorts of presentations, giving different ways of radiological images, blending solid and cystic areas. Some papers use indiscriminately expression "cystic" without pathologic proof. Just cystic grown pattern RCs and multilocular cystic carcinoma could be named "cystic renal tumors". For de rest, especially over image study, is more suitable to use expressions as "renal tumor of cystic configuration", while pathologic report are available.

The paper refers to thirteen patients with epithelial tumours of the upper urinary tract, diagnosed and treated at our unit during the last five years and emphasizes the need of early diagnosis, custumorized therapy and close follow-up. Evolution is clearly more favourable in well differentiated and low stage tumours, regardless the type of surgery performed, versus the poor results obtained in infiltrative and undifferentiated cases for which there is no effective treatment available. Results are analyzed based on a brief literature review and considering the short number of cases contributed.