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Comparison of the morphology of renal cysts and cystic renal tumors

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Pathology & Oncology Research

Abstract

Renal tumors appear uncommonly with cystic changes. They may develop due to necrosis though well-formed real cysts are also known. Such lesions may present problems in distinguishing them from benign renal cysts. Conditions leading to cyst formation are not known, however cell proliferation, altered extracellular matrix production and oncoprotein expression have been reported in cystic renal disorders. In the present study, we analysed the morphological features of 23 cystic renal tumors in comparison with 16 benign cysts using immunohistochemical and lectin binding methods. By our knowledge there has not been any publication on such studies. The cystic renal tumors were represented predominantly in males and the size of the cysts was slightly larger than that of benign cysts. Tumorous cysts shared similar morphological appearance to solitary and multilocular cysts. They all showed strong epithelial membrane antigen reactivity on the luminal surface of the cells indicating distal tubular origin. Cell proliferation and p53 expression proved to be low excluding their role in the formation of the cysts. The amount of extracellular matrix and basement membrane was increased with an elevated type IV collagen and reduced fibronectin content. Polycystic kidney disease is different from tumorous cysts as cell proliferation, p53 oncoprotein expression and the composition of extracellular matrix proved to be the opposite. As renal cell tumors arise from proximal tubules, neoplastic or metaplastic differentiation toward distal tubular direction seems to be the key event in cyst formation. Altered cell-matrix or cellcell contact can modulate this transformation providing a basis for further results.

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Authors and Affiliations

  1. Department of Pathology, University Medical School of Debrecen, P.O.B. 24, H-4012, Debrecen, Hungary

    Judit KOVÁCS, Szabolcs Gomba & Mónika Zilahy

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  1. Judit KOVÁCS
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  2. Szabolcs Gomba
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  3. Mónika Zilahy
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Correspondence to Judit KOVÁCS.

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KOVÁCS, J., Gomba, S. & Zilahy, M. Comparison of the morphology of renal cysts and cystic renal tumors. Pathol. Oncol. Res. 3, 272–277 (1997). https://doi.org/10.1007/BF02904286

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  • DOI: https://doi.org/10.1007/BF02904286

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