A Multicenter Selective Screening Study to Investigate the Frequency of Neuronal Ceroid Lipofuxinosis Type 2 (CLN2)

Inclusion Criteria: * Girls and boys aged 6 years old * Having a history of at least one seizure * With a history of idiopathic seizures; * Speech disorder or regression in acquired speaking skills, * Motor dysfunctions, * Photoparoxysmal response to EEG with low-frequency IFS, * Observation of at least one of the symptoms or signs of cerebral atrophy or preventive white matter hyperintensity on MRI * Without hypoxic ischemic encephalopathy, head trauma and developmental brain anomalies * Not having been previously diagnosed with CLN2 * The patient and/or his/her legal representative must be willing to sign the written consent form. Exclusion Criteria: * Patients younger than 2 years and older than 6 years * Patients with a known or diagnosed neurodegenerative disorder * Patients for whom written consent form cannot be obtained from their legal representative