A female infant showed the essential features of the cat eye syndrome. There were no abnormalities in the family. Chromosome studies showed an additional acrocentric chromosome in the infant, but both parents were karyotypically normal.
Cory CC, Jamison DL. The Cat Eye Syndrome. Arch Ophthalmol. 1974;92(3):259-262. doi:10.1001/archopht.1974.01010010267021