Ichthyosis, Congenital, Autosomal Recessive 9, also known as autosomal recessive congenital ichthyosis 9, is related to ichthyosis, congenital, autosomal recessive 1 and weill-marchesani syndrome 4. An important gene associated with Ichthyosis, Congenital, Autosomal Recessive 9 is CERS3 (Ceramide Synthase 3), and among its related pathways/superpathways is 22q11.2 copy number variation syndrome. Affiliated tissues include skin, and related phenotypes are hyperkeratosis and hypohidrosis