Term Name:	Kearns-Sayre syndrome
Synonyms:	KSS
Definition:	A chronic progressive external ophthalmoplegia characterized by progressive external ophthalmoplegia, pigmentary retinopathy, and one or more of heart block, cerebellar ataxia, or a cerebrospinal fluid protein level above 100 mg/dl, that has_material_basis_in deletion of mitochondrial DNA. Onset is before 20 years of age.
Ontology:	Human Disease [DOID:12934]   ( DOID:12934 )