[Simultaneous intra- and extra- uterine pregnancies (author's transl)].

Six further cases of simultaneous intra- and extra-uterine pregnancies are reported. The findings confirm those reported in the published literature. The frequency of such cases in one in 30 000 pregnancies. It is evident, however, that some cases, in which spontaneous abortion occurs, remain unrecognized, the haemorrhage being attributed to the extra-uterine gestation. In 90 p. cent of cases they are detected because of the extra-uterine pregnancy, and their clinical course is very variable. The association of pregnancies is almost as frequent as triplets but is very rarely mentioned. Valid clinical and pathogenic data could be obtained from their more systematic study.