The degree of mutant mtDNA heteroplasmy in various tissues on autopsy did not correlate well with the clinical manifestations, although this may be due at least in part to replacement with other tissue types. Our report is the first of non-autoimmune Addison disease in KSS and patients with KSS should be evaluated for adrenal insufficiency. Early recognition of adrenal insufficiency is crucial to prevent mortality from this cause.
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