Aldrenoleukodystrophy (ALD) is a hereditary disease, passed from mother to son through a genetic defect that allows a buildup of body fats that destroy the myelin sheath surround the nerves. Deafness, blindness, dementia and paralysis mark the progress of the disease, which ends in death, usually within two years after diagnosis.
ALD is rare, and is frequently misdiagnosed. It affects too small a number of children to make a search for treatment profitable.