My sister (28 yo) and myself (34 yo) have recently been diagnosed with bilateral medullary nephrocalcinosis. Mine is advanced and I also have bilateral renal cortical thinning. Our 24 hour urine tests came back fairly normal - my sister's calcium level was elevated and my total urine output was low. One Nephrologist said it is MSK, but I was under the impression that MSK is a birth defect, not a genetic disorder. Does anyone have any insight for us? Is MSK genetic? Another specialist said we will either end up with renal failure or we won't...that's pretty vague. Should we see a geneticist? We are worried and are just searching for answers - we have 6 children between the two of us and are worried that we may have passed whatever this is on to them. I'd really appreciate any feedback or related personal experiences! Thanks in advance.