A simple classification of products of conception aborted in early pregnancy is described. This classification bears a closer relation to the aetiology of the abortions and the timing of the teratological insult in those conceptuses with morphological abnormalities than have previous classifications. It is hoped it may be of value in counselling patients who abort recurrently and also in the assessment of some environmental hazards purported to cause early pregnancy wastage and congenital malformations.
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