Abstract
Kearns–Sayre syndrome (KSS) is an extremely rare form of mitochondrial myopathy characterized by progressive external ophthalmoplegia, bilateral pigmentary retinopathy, and cardiac conduction abnormalities. In addition, KSS patients might present with proximal muscle weakness, diabetes mellitus, hearing loss, cerebellar ataxia, and elevated cerebrospinal fluid protein levels.[1]
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