familial primary hypomagnesemia with hypercalciuria and nephrocalcinosis FHHNC Familial primary hypomagnesemia with hypercalciuria and nephrocalcinosis (FHHNC) is a form of familial primary hypomagnesemia (FPH), characterized by renal magnesium (Mg) and calcium (Ca) wasting, nephrocalcinosis, kidney failure and, in some cases, severe ocular impairment. Two subtypes of FHHNC are described: FHHNC with severe ocular involvement (FHHNCOI) and without severe ocular involvement (FHHN). GARD:0009891 ICD10:E83.4 MONDO:0017624 Michellis-Castrillo syndrome Orphanet:306516 UMLS:CN203511 https://rarediseases.info.nih.gov/diseases/9891/familial-primary-hypomagnesemia-with-hypercalciuria-and-nephrocalcinosis familial primary hypomagnesemia