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Intrauterine fluid accumulation in the uterus and the niche. (a) Image of niche using transvaginal ultrasound in mid-sagittal plane with high fluid accumulation in the uterus and the large niche. (b) Schematic figure of an embryo that is separated from the endometrium on a film of fluid. The intracavitary fluid in relation with the accumulation of fluid in the niche may impact embryo implantation.
