The terms you mention here are essentially for the same condition. This is a rare inherited and serious metabolic disorder which affects the white matter of the brain.There may be a greater risk in some premature infants.I would prefer it if you arranged an appointment to speak to your paediatrician or paediatric neurologist about your son's problem.If you would like to read a bit more before seeing the experts then look up 'metachromatic leukodystrophy' on Google.
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