Late-onset Mitochondrial Encephalomyopathy with Lactic Acidosis and Stroke-like Episodes (MELAS) Syndrome in a 63-year-old Patient.

Mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes (MELAS) usually manifests in early life. Clinical hallmarks of the disease are mitochondrial myopathies, encephalopathy with stroke-like episodes, seizures, and lactic acidosis. It rarely manifests in late adulthood.