Implantation of a growing embryo may occur within the abdomen if an adequate blood supply is established.
Abdominal ectopic pregnancies are extremely dangerous since the placental tissue often develops an extraordinary blood supply from many different vessels (often those that normally supply the bowel). Therefore, removal of the placenta may result in bleeding from so many different sites that hemostasis (control of bleeding) becomes impossible. Medical management (such as methotrexate) is often considered when these abdominal ectopic pregnancies are identified.
Implantation into the abdomen is (thankfully) rare.