medullary nephrocalcinosis

1' hyperparathyroidism \
renal tubular acidosis > 70%
medullary sponge kidney /
hypercalcemia / -uria
- sarcoidosis
- bony metastases
- Paget's disease
- hypervitaminosis D
- milk-alkali syndrome
- Williams syndrome (in kids)
- idiopathic
oxalosis (+/- completely opaque kidneys; younger age)