The outcome and associations of 35 consecutive cases of isolated pericardial effusion detected in the fetus are presented. In all cases included in the study, there was no evidence of a structural abnormality or a rhythm disturbance detectable antenatally. Karyotyping revealed that 26% of cases had trisomy 21 and 31% of the total had some form of chromosomal anomaly. Our study shows that the outlook for isolated pericardial effusion is good. However, there is a high incidence of associated karyotypic anomalies, in particular trisomy 21. Fetal karyotyping is therefore recommended in these cases.
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