Chromosome 8q12.1-Q21.2 Deletion Syndrome, is also known as bor-duane hydrocephalus contiguous gene syndrome. An important gene associated with Chromosome 8q12.1-Q21.2 Deletion Syndrome is DEL8Q12Q21 (Bor-Duane Hydrocephalus Contiguous Gene Syndrome). Related phenotypes are hydrocephalus and abnormality of the ear