Mitochondrial encephalomyopathies are characterized by a variability of clinical manifestations with their variability in time and a variable ratio of pathological findings in laboratory examinati- ons. On the example of a female patient with the MELAS syndrome the authors demonstrate the possibilities of diagnostic methods of magnetic resonance, the application of which can contribute to the assessment of the nature of a disease and the follow-up of its development.

        Key words: mitochondrial encephalomyopathy - MELAS syndrome - MR imaging - MR angiography - MR spectroscopy