title: Longitudinal clinicoelectrophysiologic study of a case of Lafora disease proven by skin biopsy.
abstract: A longitudinal clinicoelectrophysiologic study was undertaken of a 15-year 2-month-old girl with Lafora disease who was diagnosed by skin biopsy and an immunohistochemical method with antisera against Lafora bodies. From age 10 years 5 months, 4 months after onset, EEG disclosed progressive deterioration of background activity and incremental increase in epileptic discharges. Photosensitivity was unique: Occipital spikes and diffuse spike-wave discharges were provoked by low-frequency repetitive photic stimuli but without elicitation of myoclonic seizures. Photosensitivity completely disappeared after age 13 years 10 months. High-voltage somatosensory evoked potentials (SEPs) and high-voltage flash visual evoked potentials (F-VEPs) were seen before age 13. After age 13, progressive prolongation of I-III and I-V interpeak latencies of auditory brainstem responses (ABRs), progressive prolongation of latencies of photoevoked eyelid microvibrations, delayed latencies of pattern-reversal visual evoked potentials, and a decrease in the V/I amplitude ratio of ABRs and the previously high F-VEP amplitudes were observed.
authors.affiliation: Department of Child Neurology, Okayama University Medical School, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kobayashi
authors.forename: K
authors.initials: K
authors.lastname: Iyoda
authors.forename: Y
authors.initials: Y
authors.lastname: Ohtsuka
authors.forename: S
authors.initials: S
authors.lastname: Ohtahara
authors.forename: M
authors.initials: M
authors.lastname: Yamada
mesh_terms: D000293:Adolescent; D001706:Biopsy; D001921:Brain / Q000503:physiopathology; D004569:Electroencephalography; D004831:Epilepsies, Myoclonic / Q000473:pathology* / Q000503:physiopathology; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D012867:Skin / Q000473:pathology*; D012890:Sleep