In patients with malformations and delayed psychomotor development it is important to discard chromosomopathies. Balanced reciprocal translocations are the most frequent chromosomopathies present in 1:500 live newborns. In general, carriers have normal phenotype, but they may have infertility, abortions or children with congenital malformations. The reciprocal translocation between chromosomes 2 and 9 can lead to offspring with monosomies and trisomies of these chromosomes. Short arm monosomy of chromosome 9 may present delayed psychomotor development, trigonocephaly, facial dysmorphia and genital abnormalities. We reviewed GTG karyotype records from our Institution to identify cases with chromosomes 2 and/or 9 alterations from 2005 to 2014. We describe two cases with monosomy 9p secondary to a translocation between chromosomes 2 and 9. The patients share features of monosomy 9p24-pter, however the genotypephenotype correlation is complex due to the extension of the involved segments. We emphasize the importance of chromosomal diagnosis to offer genetic assessment.
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