A Case of Kearns-Sayre Syudrome

Kearns-Sayer syndrome, a rare mitochondrial disorder, is composed of chronic progressive external ophthalmoplegia, atypical retinal pigmentation and complete heart block, and also causes numerous neurologic or endocrinologic symptoms. On muscle biopsy, a "ragged red fiber" was seen with Gomori trichrome stain, On electron microscopy, aggregations of abnormal mitochondria were demonstrated, confirming the diagnosis of mitochondrial myopathy. We report a case of Kearns-Sayer syndrome we have experienced.