{Reference Type}: Case Reports {Title}: Adrenal Insufficiency in Mitochondrial Disease: A Rare Case of GFER-Related Mitochondrial Encephalomyopathy and Review of the Literature. {Author}: Calderwood L;Holm IA;Teot LA;Anselm I; {Journal}: J Child Neurol {Volume}: 31 {Issue}: 2 {Year}: Feb 2016 {Factor}: 2.363 {DOI}: 10.1177/0883073815587327 {Abstract}: GFER-related mitochondrial encephalomyopathy has been previously described only in 3 siblings of a consanguineous Moroccan family. Their phenotype included congenital cataracts, hypotonia, developmental delay, and sensorineural hearing loss. Multiple mitochondrial respiratory chain complex deficiencies were identified on muscle biopsy. We describe a now-19-year-old woman with adrenal insufficiency, lactic acidosis, congenital cataracts, and respiratory insufficiency secondary to mitochondrial disorder, who was reported by North et al (1996) as a toddler. Compound heterozygous GFER mutations c.373C>T (Q125X) and c.581G>A (R194 H) were recently discovered in this patient. The purpose of this report is (1) to expand the phenotype this ultra-rare disorder and (2) to provide a review of the literature describing the unique finding of adrenal insufficiency in patients with molecularly confirmed disorders of mitochondrial metabolism.