Infantile spasms are a somewhat rare, but catastrophic, form of epilepsy, which almost always start before one year of age. They are one of many symptoms that arise from TSC, a genetic disorder. Infantile spasms typically last for one to five seconds and occur in clusters of up to 100 spasms at a time, which may cause severe developmental delay if treatment is unsuccessful. The Tuberous Sclerosis Alliance produced this video to educate the general public and policymakers about the tragedy of infantile spasms and the importance of finding better treatments for this type of seizure disorder. About 50 percent of children with tuberous sclerosis complex (TSC) experience infantile spasms.