The Facts
An ectopic pregnancy occurs when a fertilized egg implants itself outside
of the uterus. Ectopic pregnancies usually occur in a fallopian tube (called
a tubal pregnancy). Occasionally, the egg may lodge itself in the ovary,
and more rarely, in the cervical canal or the abdominal or pelvic cavities.
The fertilized egg doesn't usually grow into a recognizable embryo and can't
be transplanted into the uterus.
In a normal pregnancy, the egg is fertilized in the fallopian tube. Little
hairs in the fallopian tube move the egg down to the uterus, where it implants
itself. If there's scar tissue in the fallopian tube, or it's blocked for some
other reason, the fetus will begin to grow outside of the uterus. A woman who
has an ectopic pregnancy must have the pregnancy removed because it can't develop
properly outside of the uterus and it is dangerous for a woman's health.
Although they're becoming more common in recent years, ectopic pregnancies
are generally rare.