What is cryptogenic 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 have cryptogenic infantile spasms if no cause is identified but a cause is suspected and the epilepsy is presumed to be symptomatic.

The proportion of cryptogenic cases varies from 8-42%. This wide range may be related to variations in the definition of the term cryptogenic and the age of patients at diagnosis, since assessment of developmental level in early infancy is difficult.

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