marginal placenta previa

marginal placenta previa

placenta previa in which the placenta is implanted in the lower uterine segment, with its margin touching or spreading to some degree over the internal os of the uterine cervix. During labor as the cervix dilates, bleeding may occur from the separation of the edge of the placenta from the uterus beneath it. Bleeding may be so scant as to pose no clinical problem. In some cases, frank severe hemorrhage may occur, but the pressure of the presenting part of the baby is often sufficient to act as a tamponade, arresting the hemorrhage. Diagnosis of marginal placenta previa may be suggested by the apparent location of the placenta on ultrasonic visualization. Cesarean section is not usually necessary. See also placenta previa.
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of cases Normal pregnancy 53 Marginal placenta previa 4 Hydramnios 1 Twin pregnancy 5 Incomplete abortion 16 Quadruplets 1 Anencephaly 1 Hydatidiform mole 2 Missed abortion 2 Ruptured ectopic gestation 2 Threatened abortion 3 Breech presentation 3 Intrauterine foetal death 3 Abdominal ectopic gestation 1 Right ovarian cyst 1 Oligohydramnios 1 Retroverted uterus 1 Total 100 50% of the cases were of normal pregnancy.
The diagnosis of missed abortion was made in 2 cases, hydatidiform mole in 2 cases, ectopic pregnancy in 3 cases, marginal placenta previa in 4 cases.
We included, however, in our series one case of marginal placenta previa not detectable at the time of blood collection (7 weeks of gestation) because we believe that such evidence reinforces the role of the PLAC1 gene in proper placentation and its possible ability to detect, in advance, placental dysfunctions.
For example, some radiologists might define a marginal placenta previa as the placental edge being at the cervical stroma, but many obstetricians may think of it as the placental edge at the internal os.
When the placental margin encroaches the tip of internal Os, it is termed marginal placenta previa.

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