Nephrocalcinosis, once known as Albright's calcinosis after Fuller Albright, or "Anderson-Carr" Kidneys, is a term originally used to describe deposition of calcium salts in the renalparenchyma due to hyperparathyroidism. It is now more commonly used to describe diffuse, fine, renal parenchymal calcification on radiology. During its early stages, nephrocalcinosis is visible on x-ray, and appears as a fine granular mottling over the renal outlines. These outlines eventually come together to form a dense mass. It is most commonly seen as an incidental finding with medullary sponge kidney on an abdominal x-ray. However, it may be severe enough to cause (as well as be caused by) renal tubular acidosis or even end stage renal failure, due to disruption of the renal tissue by the deposited calcium.
Nocturia, polyuria, and polydipsia from reduced urinary concentrating capacity (i.e. nephrogenic diabetes insipidus) as can be seen in hypercalcemia, medullary nephrocalcinosis of any cause, or in children with Bartter syndrome in whom essential tubular salt reabsorption is compromised.