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Abstract
Microdissection of nephrons of kidneys of children showing advanced ischemic tubular atrophy, and removed for control of hypertension, demonstrates marked proximal convoluted tubular atrophy, with formation of multiple small proximal tubular diverticula. These diverticula presumably contribute to the microscopic appearance of large numbers of small tubules lined by low epithelial cells with pale or clear cytoplasm, adjacent to glomeruli in the cortices of kidneys showing ischemic tubular atrophy (endocrine kidney). Segmentation of such atrophic tubules leads to formation of blind segments (microcysts), as demonstrated in this study and by Oliver.8 The distinctive microscopic appearance of the endocrine kidney, a not infrequent finding in kidneys of children with chronic renal insufficiency who require nephrectomy for control of hypertension, has not hitherto been emphasized in the literature on pediatric renal disease.