[Difficulties in early differential diagnosis of intra/extrauterine pregnancy].

: Employing the new very sensitive pregnancy tests, pregnancy can be confirmed several weeks before it can be visualized by ultrasonic scanning or can be seen at laparoscopy or laparotomy. This involves the risk that unnecessary diagnostic interventions are performed in early pregnancy with symptoms suggestive of extrauterine pregnancy. Three case reports are quoted to illustrate the problems involved.