The localization of the embryo is taken as the basis for the classification of ectopic pregnancy.
• Ovarian. The fertilized egg is located in the follicle on the surface of the ovary.
• Interconnective. The embryo attaches in the fallopian tube, but grows laterally between the sheets of the broad ligament. Pathology can progress asymptomatically up to four months.
• Abdominal. It is divided into primary, when the embryo is fixed on the peritoneum in the region of the omentum, spleen and even the liver. And also secondary, when the embryo is implanted in the tissues after it is ejected from the fallopian tube.
• Cervical. The fertilized egg implants in the cervix. One of the dangerous options for ectopic, since it is difficult to diagnose such an arrangement, and pregnancy can progress up to 20-30 weeks, manifesting itself in the future with bleeding that threatens the life of a woman.
• In the vestigial horn of the uterus. Possible in the case of a rudimentary uterus, the body of which is connected to the tube, but does not communicate with the vagina. With further development of the fetal egg, tissue rupture and massive intra-abdominal bleeding occur.
• Interstitial. The fertilized egg is located in the tubal angle (interstitial section of the tube), close to the body of the uterus.
According to the stage of development, pathology is classified into the following types:
• progressive;
• intermittent;
• interrupted.
A separate type of ectopic pregnancy is heterotopic. In this case, two embryos develop, one of which is implanted naturally inside the uterus, and the other - outside it. The condition is difficult to diagnose, since the examination, including ultrasound, confirms the presence of a fetal egg in the uterus.
In whatever area the embryo is fixed, it is doomed to death, since only the uterus is able to provide it with the conditions for full development and life.