Implantation sites can be anywhere in the abdomen but can include the peritoneum outside of the uterus, the rectouterine pouch (culdesac of Douglas), omentum, bowel and its mesentery, mesosalpinx, and the peritoneum of the pelvic wall and the<unk>  wall. The growing placenta may be attached to several organs including tube and ovary. Rare other sites have been the liver and spleen, giving rise to a hepatic<unk>  or splenic<unk> , respectively. Even an early diaphragmatic<unk>  has been described in a patient where an embryo began growing on the underside of the diaphragm. Primary versus secondary implantation A primary<unk>  refers to a<unk>  that first implanted directly in the peritoneum, save for the tubes and ovaries; such<unk> es are very rare, only 24 cases having been reported by 2007. Typically an<unk>  is a secondary implantation which means that it originated from a tubal (less common an ovarian)<unk>  and re-implanted. Other mechanisms for secondary<unk>  include uterine rupture, rupture of a uterine rudimentary horn and fimbrial abortion.
Abdominal pregnancy
Cervical pregnancy
Cryptic pregnancy
Heterotopic pregnancy
Malignant triton tumor
Postterm pregnancy
Recurrent miscarriage
Ectopic pregnancy