A mother has revealed her three-year-old's son debilitating battle with dementia. Joey Walton, from Wakefield, West Yorkshire, was diagnosed with metachromatic leukodystrophy (MLD), a rare genetic condition that causes fatty substances to build up in the nerves, organs, spinal cord and brain, as a baby. MLD causes the loss of both physical and mental skills, meaning that Joey is unlikely to make it to the age of seven.
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