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This drawing is from Dr Ask-Upmark’s 1929 article on segmental hypoplasia depicts kidneys with hypoplastic foci. Notice the deep cortical grooves that approximate underlying minor calyces. Reprinted from Ask-Upmark,12 Fig. 1. With permission from John Wiley and Sons. Copyright John Wiley and Sons, Hoboken, NJ. All permission requests for this image should be made to the copyright holder.
