NPRL2 and fleck corneal dystrophy: Consequently, all patients, aged 2 months to 13 years, were diagnosed with FCD II refractory epilepsy and classified as having sporadic epilepsy with undefined genetic mutations, except patient 3, who had a somatic mutation in NPRL2 identified in blood cells and isolated astrocytes through whole‐exome sequencing (Figure S1B, Supporting Information).