What is idiopathic infantile spasm (West syndrome)?

Updated: Jan 11, 2019
  • Author: Tracy A Glauser, MD; Chief Editor: Stephen L Nelson, Jr, MD, PhD, FAACPDM, FAAN, FAAP  more...
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Patients may be considered to have idiopathic infantile spasms if normal psychomotor development occurs prior to the onset of symptoms, no underlying disorders or definite presumptive causes are present, and no neurologic or neuroradiologic abnormalities exist. Some investigators use the terms idiopathic and cryptogenic interchangeably. The percentage of idiopathic cases reportedly is 9-14%.

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