The occurrence of anencephalic monsters is not extremely rare. Few obstetricians that have attended many births have failed to observe one instance at least of this type of monstrosity. Ballantyne1 in a series of 325 cases of monstrosity and fetal disease found forty-six anencephalics, an incidence of 14 per cent.
The case here reported is placed on record because of family prevalence, which in itself is a rare occurrence. In only two of Ballantyne's series had the mother previously given birth to an anencephalic fetus. This was noted in 1861 also by Lammert2 and a little later by Carli,3 who reported the birth of three anencephalic fetuses occurring in succession as in the case here related. Martin4 has reported the history of six anencephalic births in the course of the reproductive life of one woman. This woman had also given birth to two normal infants and
THOMS H. FAMILY PREVALENCE IN ANENCEPHALY: REPORT OF CASE. JAMA. 1918;70(1):10–11. doi:https://doi.org/10.1001/jama.1918.02600010008003
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