Dear Friend, greetings. Methyl elevated melanoic acid indicates that you have B 12 deficiency. B12 deficiency also causes combined degeneration of neurons that might be the reason for encephalopathy. You need to get schillings test done to know the proper cause of B12 deficiency. It could be nutritional if you are a vegan . It could also be petnecious anemia at atropic gastritis. You start taking cobalamin injection now and later get eveluated further . do feel free to contact us . thank you.