Additive congenital anomaly patterns

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Abstract
A family study was conducted on 1,038 index patients with unidentified multiple congenital abnormality (MCA) patterns in the population‐based material of the Hungarian Congenital Malformation Registry (HCMR). Congenital abnormalities (CAs) were detected in 5.1% of fathers and in 4.2% of mothers, respectively. Two fathers had an MCA pattern similar to that in their affected child. One component CA of multimalformed index children occurred in 55.1% of fathers and 52.3% of mothers. Thus, in more than half of affected parent–child pairs, there may be a causal connection between the observed anomalies. The combination of CAs of different parental origin in index patients is called “additive CA pattern.” This group of patients may represent about 5% of unidentified MCA patterns and about 50% of affected parent–childpairs.

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