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American Journal of Pathology, Vol 129, 92-101, Copyright © 1987 by American Society for Investigative Pathology

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Epithelial hyperplasia in human polycystic kidney diseases. Its role in pathogenesis and risk of neoplasia

J Bernstein, AP Evan and KD Gardner Jr
Department of Anatomic Pathology, William Beaumont Hospital, Royal Oak, Michigan 48072.

The importance of tubular epithelial hyperplasia in polycystic kidney diseases has become apparent during the last decade. Micropapillary hyperplasia occurs in autosomal dominant polycystic kidney disease, in localized cystic disease, and in acquired cystic disease. Neoplastic or severely dysplastic epithelial hyperplasia occurs in von Hippel-Lindau disease. A histopathologically distinctive epithelial hyperplasia occurs in tuberous sclerosis. In each of these conditions, epithelial hyperplasia may be related to cyst formation and may also impose an increased risk of malignancy--a risk that seems to be highest in patients under treatment with long-term hemodialysis for end-stage kidney disease. Although hyperplasia in some of these diseases may share a common pathway of development, it is more probable that the histopathologic differences reflect different pathogenetic pathways that converge on a common endpoint.

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