Any autosomal recessive congenital ichthyosis in which the cause of the disease is a mutation in the CASP14 gene. The disease is ichthyosis, congenital, autosomal recessive 12 (MONDO_0015018). Also known as: ARCI12, ichthyosis, congenital, autosomal recessive 12; ARCI12, ichthyosis, congenital, autosomal recessive type 12.