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West Syndrome
Hypsarrhythmia rarely persists beyond the age of 24 months. … Asymmetric hypsarrhythmia. … Hypsarrhythmia with a consistent focus of abnormal discharge.[1]
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Angelman Syndrome
Differential diagnosis Differential diagnosis includes hypsarrhythmia in West syndrome or the petit mal variant pattern in Lennox-Gastaut syndrome (see these terms).[2]
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Congenital Disorders
suffer severe neurological impairment including profound psychomotor retardation and intractable seizures, eye abnormalities, optic atrophy, postnatal microcephaly, and hypsarrhythmia … The single patient thus far identified with this form of CDG exhibited severe psychomotor retardation, spasms, hypsarrhythmia, and irregular nystagmus (involuntary eye movements … Patients with CDG-IIm exhibit early-infantile epileptic encephalopathy, developmental delay, hypotonia, variable ocular anomalies, seizures, hypsarrhythmia, poor feeding,[3]
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Beta-Ureidopropionase Deficiency
EEG Shows Hypsarrhythmia
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Neonatal Meningitis
The electroencephalogram showed hypsarrhythmia intercepted by multifocal and generalized paroxysmal discharges and the brain MRI revealed a large right frontal cystic lesion[4]
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Cerebellar Atrophy
These become refractory as documented by the EEG which shows severe background slowing, multifocal origins, and hypsarrhythmia.[5]
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Ganglioglioma
Infantile spasms developed at age 6 months, an electroencephalogram revealing simultaneous hypsarrhythmia.[6]
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Myasthenia Gravis
Type 2 fiber predominance Atrophy No tubular aggregates CNS Cerebral atrophy: Progressive Delayed myelination Astrocytosis Neuron loss: Multifocal EEG Burst-suppression Hypsarrhythmia[7]
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Leber's Hereditary Optic Neuropathy
opticoacoustic nerve atrophy with dementia; diabetes insipidus, diabetes mellitus, optic atrophy and deafness (DIDMOAD or Wolfram's syndrome); progressive encephalopathy with oedema, hypsarrhythmia[8]
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Optic Atrophy
opticoacoustic nerve atrophy with dementia; diabetes insipidus, diabetes mellitus, optic atrophy and deafness (DIDMOAD or Wolfram's syndrome); progressive encephalopathy with oedema, hypsarrhythmia[9]