The most common type ofdiaphragmatic defect was a posterolateral hernia (92%), followed in frequency by an eventration of the diaphragm (50 %), the least common defect being a retrocostosternal hernia (2%). Diaphragmatic hernia appears to be aetiologically as well as anatomically heterogeneous. In this series there were two cases of trisomy 18, one case of trisomy 21, one case trisomic for a small part of chromosome 20, and two cases with the Pierre Robin syndrome. It seems likely that diaphragmatic hernia is a non-specific consequence of several teratological processes.
SUMMARY A study of diaphragmatic hernia in Avon suggests that the incidence of this malformation is increasing. The incidence in Avon from 1974 to 1977 was 0*54 per 1000 births, higher than any previously published figure for the incidence of diaphragmatic hernia. Neither a monthly trend nor clustering in time was detected.
DiscussionThe data collected for Avon suggest an increasing incidence of diaphragmatic hernia. The figure of 0 54
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