Syndrome complex that has characteristics of the cutaneous features of xeroderma pigmentosum together with the systemic and neurological features of Cockayne syndrome. Less than 30 cases have been described to date. The disease manifests during infancy. Patients present with cutaneous UV-sensitive lesions that generally develop into skin cancer and also develop characteristic Cockayne syndrome manifestations such as microcephaly, hydrocephalus, cachexia, premature ageing, dwarfism, skin atrophy, arteriosclerosis, progressive hearing loss, cognitive deficit, spasticity, ataxia, pigmentary retinopathy and optic atrophy. Affected individuals have mutations in one of three XP genes: ERCC3 (2q21), ERCC2 (19q13.3), or ERCC5 (13q22-q34). Transmission is autosomal recessive. [from
SNOMEDCT_US]