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To the Editor.— Jacinto et al1 presented data concerning a group of 20 very low birth weight infants with renal calcification, most of whom had hypercalciuria. For 13 of these infants, furosemide administration was presumed to be the major factor contributing to the renal abnormality. For the remaining seven, there was no apparent basis for the increased calcium excretion and nephrocalcinosis. Although these children may have a heterogenous group of disorders, we suggest a specific diagnosis that may have been present in one or more of them.