Mitochondrial cytopathies are a group of heterogeneous disorders characterized by multisystem involvement. Renal involvement in mitochondrial cytopathies is usually manifested as tubular dysfunction owing to impaired energy metabolism; however, a few cases with glomerular changes have also been reported. Herein we report the case of a 4-month-old Turkish girl with a mitochondrial DNA deletion and focal segmental glomerulosclerosis. (J Child Neurol 2005;20:83—84).
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