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An important risk factor for placenta accreta is placenta previa in the presence of a uterine scar. Placenta previa is an independent risk factor for placenta accreta. Additional reported risk factors for placenta accreta include maternal age and multiparity, other prior uterine surgery, prior uterine curettage, uterine irradiation, endometrial ablation, Asherman syndrome, uterine leiomyomata ...
You mention that placenta percreta and placenta increta are variants of placenta accreta. That is imprecise. The umbrella term for these conditions is placent creta. The prefix accreta describes a placenta that is firmly anchored to the placental site but not invading the myometrium. This is the commonest situation.
The placenta (pl.: placentas or placentae) is a temporary embryonic and later fetal organ that begins developing from the blastocyst shortly after implantation.It plays critical roles in facilitating nutrient, gas and waste exchange between the physically separate maternal and fetal circulations, and is an important endocrine organ, producing hormones that regulate both maternal and fetal ...
One theory is that velamentous cord insertion may arise from the process of placental trophotropism, which is the phenomenon where the placenta migrates towards areas which have better blood flow with advancing gestation. The placenta grows in regions with better blood supply and portions atrophy in regions of poor blood flow.
Invasion of the trophoblast too deeply may cause conditions such as placenta accreta, placenta increta, or placenta percreta. Gestational trophoblastic disease is a pregnancy-associated concept, forming from the villous and extravillous trophoblast cells in the placenta.
Retained placenta is a condition in which all or part of the placenta or membranes remain in the uterus during the third stage of labour. [1] Retained placenta can be broadly divided into: failed separation of the placenta from the uterine lining; placenta separated from the uterine lining but retained within the uterus
Prenatal and perinatal psychology can be seen as a part of developmental psychology, although historically it was developed in the heterogenous field of psychoanalysis. Prenatal and perinatal psychology are often discussed together to group the period during pregnancy, childbirth, and through the early stages of infancy.
This layer is absent in placenta accreta. [2] Micrograph of decidualized endometrium due to exogenous progesterone. H&E stain. The decidua has a histologically-distinct appearance, displaying large polygonal decidual cells in the stroma. These are enlarged endometrial stromal cells, which resemble epithelium (and are referred to as "epithelioid").