Abstract
Kearns–Sayre syndrome (KSS) is a rare mitochondrial disease was first described in 1958. The characteristic triad is age of onset less than 20 years, progressive external ophthalmoplegia, pigmentary retinopathy, The prevalence rate of KSS is nearly 1–3 per 100 000 individuals. Here, we report a rare case of a 11-year-old male with KSS.
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