Abnormal renal morphology Nephrogenic rest 2011-12-01T02:41:34Z Abnormally persistent clusters of embryonal cells, representing microscopic malformations (dysplasias) of the developing kidney. UMLS:C1320468 Though NR are best known as precursors of Wilms tumor (WT), many alternative fates are observed, and most rests are destined for eventual atresia. Nephroblastomatosis refers to the presence of multifocal or diffuse nephrogenic rests. SNOMEDCT_US:405933007 HP:0100880