Methylmalonic acidemia with homocystinuria is an inborn error of vitamin B12 (cobalamin) metabolism characterized by megaloblastic anemia, lethargy, failure to thrive, developmental delay, intellectual deficit and seizures. There are four complementation classes of cobalamin defects (cblC, cblD, cblF and cb1J) that are responsible for methylmalonic acidemia - homocystinuria (methylmalonic acidemia - homocystinuria cblC, cblD cblF and cblJ; see these terms). The disease is Methylmalonic acidemia with homocystinuria (Orphanet_26). Also known as: Combined defect in adenosylcobalamin and methylcobalamin synthesis, Methylmalonic aciduria with homocystinuria.