Hydrocephalic fetus in an abdominal pregnancy.

We present an unusual case of an abortion at 20 weeks elected after a diagnosis of fetal hydrocephalus and spina bifida. Unsuccessful attempts at abortion with prostaglandin suppositories ultimately led to a diagnosis of abdominal pregnancy. This is the first reported case of an abdominal pregnancy discovered during an abortion that was elected because of an anomaly identified by ultrasound.