<unk>  is a syndrome which involves retinal degeneration, cataract, microcephaly, and mental retardation. It was first characterized in 1972. There is evidence that this syndrome has a different mutation in the same gene as Cohen syndrome.
Mirhosseini–Holmes–Walton syndrome
Schwartz–Matsuo syndrome
Aarskog–Scott syndrome
Morgagni Stewart Morel syndrome
Daentl Townsend Siegel syndrome
Romano–Ward syndrome
Allan–Herndon–Dudley syndrome
Frank–Ter Haar syndrome