<unk>  (also tetrasomy 12p mosaicism or<unk>  mosaic aneuploidy<unk>  is an extremely rare genetic disorder occurring in humans.<unk><unk>  occurs due to the presence of the anomalous extra isochromosome 12p, the short arm of the twelfth chromosome. This leads to the development of tetrasomy 12p. Because not all cells have the extra isochromosome,<unk><unk>  is a mosaic condition.
It was first described by Philip<unk>  in 1977 and further researched by Maria Teschler-Nicola and Wolfgang<unk>  in 1981.
Pallister–Killian syndrome
Ohtahara syndrome
Cohen syndrome
Young Simpson syndrome
Hurler-Scheie syndrome
Gerstmann syndrome
Galloway Mowat syndrome
Zunich-Kaye syndrome