“…As yet relatively little precise information is available, though some microdissection studies have already been made on cystic kidneys by Greene (1922), Bialestock (1956Bialestock ( , 1960, Paatela (1961), and Osathanondh and Potter (1964), and ofcysts associated with infantile nephrosis or microcystic renal disease by Oliver (1960), Giles, Pugh, Darmady, Stranack, and Woolf (1957), Fetterman and Feldman (1960), and Paatela (1961Paatela ( , 1963. These cysts show a wide variety of forms in regard to size, shape, and relation to the tubules which, in a group of reasonably comparable examples, can be recognized as being stages in the evolution of the larger (presumably older), well-developed forms.…”