Prenatal diagnosis and molecular cytogenetic characterization of partial dup (18p)/del (18q) due to a maternal pericentric inversion 18 in a foetus with multiple anomalies.

The 18q terminal deletion with inverted duplication is an extremely rare abnormality, with only three confirmed cases in Europe to date. Here, we report, for the first time, a case of de novo 18q inv-dup-del in a Turkish pregnant woman. A 30-year-old pregnant woman was referred for genetic analysis at her 25th gestational week due to foetal diaphragmatic hernia and rocker bottom feet. Cytogenetic analysis of the parents revealed a karyotype of 46,XX,inv(18) (p11.3q21.3) of the mother and a normal karyotype of the father. The foetal karyotype was defined as 46,XX,rec(18)del(18q)inv(18) (p11.3q21.3)mat. To our knowledge, this is the first report of a prenatal diagnosis. Genetic counselling issues for this family, particularly affected individuals, include an increased likelihood of reduced fertility and a risk of recurrence of parental inversion equal to 1/2 in surviving offspring.

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Declaration of competing interest The authors have no conflicts of interest relevant to this article.