title: The neuroimaging of Leigh syndrome: case series and review of the literature.
abstract: Leigh syndrome by definition is (1) a neurodegenerative disease with variable symptoms, (2) caused by mitochondrial dysfunction from a hereditary genetic defect and (3) accompanied by bilateral central nervous system lesions. A genetic etiology is confirmed in approximately 50% of patients, with more than 60 identified mutations in the nuclear and mitochondrial genomes. Here we review the clinical features and imaging studies of Leigh syndrome and describe the neuroimaging findings in a cohort of 17 children with genetically confirmed Leigh syndrome. MR findings include lesions in the brainstem in 9 children (53%), basal ganglia in 13 (76%), thalami in 4 (24%) and dentate nuclei in 2 (12%), and global atrophy in 2 (12%). The brainstem lesions were most frequent in the midbrain and medulla oblongata. With follow-up an increased number of lesions from baseline was observed in 7 of 13 children, evolution of the initial lesion was seen in 6, and complete regression of the lesions was seen in 3. No cerebral white matter lesions were found in any of the 17 children. In concordance with the literature, we found that Leigh syndrome follows a similar pattern of bilateral, symmetrical basal ganglia or brainstem changes. Lesions in Leigh syndrome evolve over time and a lack of visible lesions does not exclude the diagnosis. Reversibility of lesions is seen in some patients, making the continued search for treatment and prevention a priority for clinicians and researchers.
authors.affiliation: Department of Diagnostic and Interventional Imaging, The University of Texas Medical School at Houston, 6431 Fannin St., MSB 2130b, Houston, TX, 77030, USA. eliana.e.bonfante.mejia@uth.tmc.edu.
authors.forename: Eliana
authors.initials: E
authors.lastname: Bonfante
authors.affiliation: Department of Pediatrics, Division of Child and Adolescent Neurology, Mitochondrial Center of Excellence Leigh Clinic, The University of Texas Medical School at Houston, Houston, TX, USA.
authors.forename: Mary Kay
authors.initials: MK
authors.lastname: Koenig
authors.affiliation: Department of Pediatrics, Division of Child and Adolescent Neurology, The University of Texas Medical School at Houston, Houston, TX, USA.
authors.forename: Rahmat B
authors.initials: RB
authors.lastname: Adejumo
authors.affiliation: Department of Pediatrics, Division of Child and Adolescent Neurology, The University of Texas Medical School at Houston, Houston, TX, USA.
authors.forename: Vinu
authors.initials: V
authors.lastname: Perinjelil
authors.affiliation: Department of Diagnostic and Interventional Imaging, The University of Texas Medical School at Houston, Houston, TX, USA.
authors.forename: Roy F
authors.initials: RF
authors.lastname: Riascos
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging* / Q000473:pathology*; D002675:Child, Preschool; D003937:Diagnosis, Differential; D019317:Evidence-Based Medicine; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007223:Infant; D007231:Infant, Newborn; D007888:Leigh Disease / Q000000981:diagnostic imaging* / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D059906:Neuroimaging / Q000379:methods*
keywords: Basal ganglia; Brainstem; Children; Leigh syndrome; Magnetic resonance imaging; Mitochondrial disease; Necrotizing demyelination