In their prospective neurodevelopmental evaluation of children with combined methylmalonic acidemia and homocystinuria, cobalamin C type (MMAHCC), Weisfeld-Adams et al. [1] obtained a magnetic resonance imaging and spectroscopy (MRI/MRS) of the brain. While the authors report a range of MRI brain abnormalities similar to previously published series, MR spectra were found to be normal in all sub...
