3-Hydroxy-3-Methylglutaryl-Coa Synthase-2 Deficiency, also known as mitochondrial hmg-coa synthase deficiency, is related to 3-hydroxy-3-methylglutaryl-coa synthase deficiency and hypertriglyceridemia 1, and has symptoms including diarrhea and vomiting. An important gene associated with 3-Hydroxy-3-Methylglutaryl-Coa Synthase-2 Deficiency is HMGCS2 (3-Hydroxy-3-Methylglutaryl-CoA Synthase 2). Affiliated tissues include liver, and related phenotypes are hepatomegaly and vomiting