disease responds to cobalamin methylmalonic acidemia vitamin B12-responsive methylmalonic acidemia https://rarediseases.info.nih.gov/diseases/12623/vitamin-b12-responsive-methylmalonic-acidemia https://www.malacards.org/card/vitamin_b12_responsive_methylmalonic_acidemia An inborn error of vitamin B12 (cobalamin) metabolism characterized by recurrent ketoacidotic comas or transient vomiting, dehydration, hypotonia and intellectual deficit, which responds to vitamin B12. There are three types: cblA, cblB and cblD-variant 2 (cblDv2). MEDGEN:575193 SCTID:69614003 adenosylcobalamin deficiency GARD:0012623 Orphanet:28 UMLS:C0342720 MONDO:0017214 vitamin B12-responsive methylmalonic aciduria classic organic aciduria inborn disorder of cobalamin metabolism and transport obsolete nephropathy secondary to a storage or other metabolic disease