Abstract
Neurological abnormalities have been occasionally associated with Leber's hereditary optic neuropathy (LHON). We describe four patients with spastic dystonia from two of our 35 LHON families. Magnetic resonance imaging revealed signal alterations of globus pallidus, putamen, internal capsula, and substantia nigra. Neuropathological findings in one of the patients with dystonia are described. Each of the dystonia families carries a different mtDNA mutation; one at np 3460 and one at np 11778. Periventricular multiple sclerosis-like white matter lesions were observed in one individual from a third family with the mtDNA 3460 mutation. Neurological disorders are probably underestimated in association with LHON.
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