<prompt> Nephrocalcinosis is seen in all except?Polycystic kidneyHyperparathyroidismMedullary sponge kidneyRenal tubular acidosis  <response>: Causes of Nephrocalcinosis Medullary sponge kidney Hyperparathyroidism Hypoparathyroidism Renal tubular acidosis Renal tuberculosis Hyperoxaluria Milk-alkali syndrome Sarcoidosis 