Abstract
Cystic disorders of the kidney are a heterogeneous group comprising developmental, heritable, and acquired disorders. The cysts themselves present few distinctive or diagnostic features. Their classification is based, therefore, on associated phenomena. Renal cysts are thus separated into seven major categories: dysplasia, polycystic disease, hereditary syndromes, cortical cysts, medullary cysts, miscellaneous intrarenal cysts, and extraparenchymal cysts. Subcategories of each have been based on morphologic patterns, radiographic demonstration of dye excretion and of vasculature, genetic analysis, and clinical evaluation of renal function in order to reduce heterogeneity and to gain reasonable clinicalpathological correlation. This classification is, of course, subject to constant revision.

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