Renal hypoplasia and dysplasia: a radiological and pathological correlation.

Forty-nine cases of congenitally small (hypoplastic) or maldifferentiated (dysplastic) kidneys have been reviewed. From a detailed consideration of the radiological and pathological data in these patients a classification of renal hypoplasia and dysplasia has been derived which is based not only on the abnormalities in the kidney, but also on the associated anomalies seen in the ureters and in the lower urinary tract.