Risk factors are similar to tubal<unk>  with sexually transmitted disease playing a major role; however about half of those with ectopic<unk>  have no known risk factors (which include damage to the Fallopian tubes from previous surgery or from previous ectopic<unk> , and tobacco smoking).
Abdominal pregnancy
Cervical pregnancy
Cryptic pregnancy
Heterotopic pregnancy
Malignant triton tumor
Postterm pregnancy
Recurrent miscarriage
Ectopic pregnancy