[Clinical case of the month. MELAS syndrome].

A patient, born in 1961, was first examined for autoimmune hyperthyroïd at the age of 25. Then, several episodes of serious dehydration and alteration of general condition were followed by a severe encephalopathy with a symptomatology of stroke-like episodes, and during a hospitalization, a volvulus of the colon. Epilepsy developed also. A MELAS syndrome was diagnosed when she was 32 years old, based on her clinical metabolic history of the presence of Ragged-Red-Fibers at muscular biopsy and of the genetical analysis. At the age of 37, after a new episode of encephalopathy, the patient fell into a rapidly evolving coma and deces.