title: Tetraploidy in a liveborn infant with spina bifida and other anomalies.
abstract: Although tetraploidy of human chromosomes (92,XXYY) has been described frequently in abortuses, only one example in a liveborn infant has previously been described. A second malformed infant with a complete tetraploid chromosome complement, who lived for 15 days, is reported. In addition to many of the malformations described in the first case, this infant also had a sacral myelomeningocele and skeletal anomalies. The probable origin of the tetraploidy was a failure of cytoplasmic cleavage at the first mitotic division of the fertilised ovum.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D000782:Aneuploidy; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D010641:Phenotype; D016136:Spina Bifida Occulta / Q000235:genetics*