 Bone marrow transplantation BMT has been the only partially effective treatment reported for MLD. BMT has been shown to halt disease progression when asymptomatic patients achieve engraftment prior to the age at which symptoms occurred in an affected, symptomatic sibling. Despite stabilization of the clinical course when receiving BMT before symptoms, patients neurophysiologic test abnormalities persist. The clinical implication of this finding has not been further researched. Patients who show mild to moderate progression of their disease prior to transplantation continue to exhibit disease progression to severe impairment. However, specific degrees of clinical impairment in neurodevelopmental function have not been monitored to determine what level of cognitive and motor impairment can be present and still allow the patient to confer benefits from treatment. Patients with late infantile MLD appear to benefit the least from the transplantation process based on preliminary unpublished data. Several case report studies for patients with late infantile MLD indicate delayed, but continued progression of the disease despite BMT, while others suggest initial deterioration followed by stabilization. 