<unk>  is a rare disease due to the deletion of the short arm on chromosome 4 which causes severe to profound mental retardation, microcephaly (small head), seizures, poor muscle tone, and cleft lip and/or cleft palate.
Wolf-Hirschhorn syndrome
Weissenbacher-Zweymüller syndrome
Wolman disease
XX male syndrome
Kallmann syndrome
Grahmann's syndrome
Goldberg–Shprintzen syndrome
Camurati-Engelmann disease