Malformations and minor anomalies in children whose mothers had prenatal diagnosis: Comparison between CVS and amniocentesis

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Abstract
The frequency of abortion following chorionic villus sampling (CVS) is similar to that following amniocentesis. However, there is no information on long‐term effects, such as malformations in liveborn children exposed to CVS. We evaluated 189 infants whose mothers had either CVS or amniocentesis as participants in the Canadian Collaborative Randomized Trial, a prospective assessment of the safety of CVS compared with amniocentesis. The participation rate of children who could be contacted was 95%. Ninety‐five of the 189 infants (50.2%) had been exposed to CVS, 87 (46%) to amniocentesis, and 7 (3.8%) to both. (The latter group was excluded from calculations.) One hundred twenty‐eight (128) children had ⩾ one minor anomalies but no major abnormalities: 58 of 95 (60%) in the CVS and 70 of 87 (80%) in the amniocentesis group. Twenty‐six children had malformations: 17 (17.8%) in the CVS and 9 (10.3%) in the amniocentesis group. Only one anomaly, Sturge‐Weber dysplasia (amniocentesis group), was potentially severe and none were life‐threatening. Superficial cavernous hemangiomas (strawberry nevi) were noted more frequently in children in the CVS group (12.6%) than in the amniocentesis group (3.4%), but only slightly higher than in the general public. We conclude that exposure to CVS is not associated with an increased frequency of malformations or minor anomalies in infants compared with amniocentesis although we observed a higher frequency of superficial cavernous (strawberry) hemangiomas in the children in the CVS group.