Kearns-Sayre Syndrome
Differential diagnosis CPEO must be differentiated from other disorders associated with ophthalmoplegia. These include isolated CPEO, oculopharyngeal muscular dystrophy, myotonic dystrophy, isolated oculopharyngeal myopathy, and mendelian CPEOs associated with multiple deletions of mtDNA such as POLG It is Kearns-Sayre syndrome Kearns-Sayre syndrome (KSS) is a clinical subtype of chronic progressive external ophthalmoplegia (CPEO). KSS is defined by the following triad: