Independent Occurrence of Two Cases of Lennox — Gastaut Syndrome and Neurofibromatosis in the Family: A Clinical Observation

Abstract

Developmental and epileptic encephalopathies (DEE) are the most difficult problem in epileptology. Lennox — Gastaut syndrome (LGS) is a developmental and epileptic encephalopathy with onset in childhood, manifested by: frequent polymorphic seizures, including tonic axial ones; severe cognitive impairment; slow activity (with a frequency of <2.5–3.0 Hz) sharp-slow wave in the interictal period on the electroencephalogram, as well as runs of fast activity with a frequency of 10–20 Hz, often associated with tonic seizures; and resistance to therapy. Presumably genetic or forms with an unknown cause account for 20–30 % of cases of LGS, but a family history of epilepsy among patients with LGS is observed in only 2.5 %.The purpose of this work was to describe a familial case of LGS in two siblings.Materials and methods. A retrospective description of the medical history of 3 siblings born in a consanguineous marriage was performed.Results and discussion. There was a similarity in the course of the disease in the two brothers, absolute resistance to drug antiepileptic therapy and temporary effectiveness of hormonal therapy for LGS with a decrease in the duration of the effect from course to course. In addition, the rare parallel existence in this family of another autosomal dominant disease — neurofibromatosis type 1 — is shown.Conclusion. A detailed description of LGS within one family will not only expand doctors’ knowledge of this disease and the difficulties of its treatment, but also improve understanding of the genetic mechanisms of the development of DEE.