X-linked complicated corpus callosum dysgenesis is a historical term used to describe a phenotype now considered to be part of the L1 clinical spectrum (L1 syndrome). The disorder is characterized by variable spastic paraplegia, mild to moderate intellectual deficit, and dysplasia, hypoplasia or aplasia of the corpus callosum. The disease is X-linked complicated corpus callosum dysgenesis (MONDO_0010569, a Monarch Disease Ontology term). Also known as: corpus callosum, partial agenesis of, X-linked recessive.