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Eighty-eight cases of abdominal wall defect with and without other lesions were ascertained by reviewing all labour room records in the West of Scotland, all surgical admissions to the Royal Hospital for Sick Children, Yorkhill, and all post mortems at Royal Hospital for Sick Children between 1978 and 1981. The affected cases comprised 39 terminations of pregnancy (17 of anterior abdominal wall defect without neural tube defect), 20 spontaneous stillbirths and 29 livebirths. All 10 cases of body stalk anomaly, 37.5 per cent of 16 gastroschisis cases and 53 per cent of 62 exomphalos cases had additional severe abnormalities. Abnormal karyotypes were present in seven out of 19 exomphalos cases but all karyotypes from 10 gastroschisis and 6 body stalk anomaly cases were normal. No correlation was found between the maternal serum AFP levels, the amniotic AFP levels and acetylcholinesterase results and the size of the lesion. It is proposed that anterior abdominal wall defects detected prenatally should have chromosome analysis and careful ultrasound to exclude associated severe anomalies before coming to a decision about termination. This policy was implemented in six pregnancies complicated by fetal gastroschisis without severe associated anomalies which were identified in the second trimester and continued to term. Immediate surgical repair was achieved in each case, although two of the infants succumbed from later complications of gastroschisis closure and one from respiratory distress syndrome. The remaining three infants made a satisfactory recovery.