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The junction zone (JZ), or a small distinct hormone-dependent region at the endometrial-myometrial interface, may be assessed by three-dimensional transvaginal ultrasound (3D TVUS) and MRI. Features of adenomyosis are disruption, thickening, enlargement or invasion of the junctional zone. [ 21 ]
Anyway, the phenomenon of smooth muscle cell metaplasia occurring in association with endometriosis (endomyometriosis), as well as of smooth muscle differentiation at endometrio-myometrial junction independently from actually engendering uterus-like configurations in several locations of the pelvis, have been pointed out by several authors. [7] [8]
The myometrium is located between the endometrium (the inner layer of the uterine wall) and the serosa or perimetrium (the outer uterine layer).. The inner one-third of the myometrium (termed the junctional or sub-endometrial layer) appears to be derived from the Müllerian duct, while the outer, more predominant layer of the myometrium appears to originate from non-Müllerian tissue and is ...
Uterine adenomyoma, the localized form of uterine adenomyosis, is a tumor composed of endometrial gland tissue and smooth muscle in the myometrium. [2] Adenomyomas containing endometrial glands are also found outside of the uterus, most commonly on the uterine adnexa but can also develop at distant sites outside of the pelvis . [ 3 ]
These arteries meet the myometrial-endometrial junction and lead to straight and endometrial arteries. [1] The endometrium receives blood from endometrial arteries which are also called spiral arteries. Endometrial arteries proliferate rapidly and react to different hormones released.
Bandl's ring (also known as pathological retraction ring) is the abnormal junction between the two segments of the uterus; it is a late sign associated with obstructed labor. [1] Prior to the onset of labor, the junction between the lower and upper uterine segments is a slightly thickened ring.
DES is a known teratogen, by crossing the placenta DES disrupts organogenesis by disorganising uterine muscle layers causing maldevelopment of uterus and uterine tube junctions. This prevents normal columnar ciliated cell formation of the vaginal epithelium and reabsorption of vaginal glands. [ 23 ]
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, uterine anomalies, and smoking.