what is leigh disease
Leigh's Disease Definition. Leigh's disease: A rare genetic disorder characterized by progressive damage to the central nervous system. Leigh's disease is caused by a defect in the function of mitochondria within the cells of the body.Symptoms begin in infancy and include poor sucking ability, the loss of head control and motor skills, loss of appetite, vomiting, irritability, continuous crying, and seizures.eigh's Disease Definition. Leigh's disease: A rare genetic disorder characterized by progressive damage to the central nervous system. Leigh's disease is caused by a defect in the function of mitochondria within the cells of the body.