Fig. 1.

Distribution of Mitochondrial syndromes (total 74). The absolute number of cases are shown in parentheses. Abbreviations: CPEO Chronic progressive external ophthalmoplegia, KSS Kearns Sayre syndrome, LHON Leber hereditary optic neuropathy, MEGDEL 3-methylglutaconic aciduria, deafness, encephalopathy, and Leigh-like disease, MELAS Mitochondrial Encephalopathy, lactic acidosis, and stroke-like episodes, MERRF Myoclonus Epilepsy with ragged red fibers, MIDD Maternally Inherited Diabetes and Deafness