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Keywords:

  • collecting duct;
  • kidney;
  • tumours;
  • carcinoma

Six cases of renal epithelial neoplasms, which show atypical histological features previously described in cases of collecting duct carcinomas, are presented. The tumours were of a tubulo-papillary architecture, arose in the renal medulla and showed prominent infiltrating tubules with an associated desmoplastic reaction. Atypical hyperplastic changes were present in the medullary collecting ducts in five cases.