Cockayne syndrome
a hereditary disorder characterized by microcephaly, dwarfism, premature aging, severe photosensitivity, hearing loss, and moderate to severe learning delays. There are three types: Type 1 (Type A) is diagnosed during early childhood; Type 2 (Type B) is a more severe form in which growth and developmental abnormalities are present at birth; and Type 3 (Type C) is a milder form of the disorder. Individuals with Type 1 or 2 usually do not survive past childhood, whereas those with Type 3 live into adulthood. [reported in 1936 by Edward Alfred Cockayne (1880–1956), British physician]