NOTCH3 and Cognitive impairment: A novel heterozygous variant in exon 4 of the NOTCH3 gene (p.Cys206Trp; NM_000435.3:c.618C>G) was found in a 67‐year‐old woman who suffered from recurrent ischemic strokes, cognitive impairment, depression, and headache, as well as her son, who presented with headache, anxiety disorder, and insomnia.