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Axial T2-weighted imaging showing a gestational sac (thick black arrow) implanted within the anterior myometrium of the lower uterine segment. The gestational sac shows a well-formed fetal pole within and is surrounded by a well-appreciated decidual reaction (thick white arrow). A thin rim of myometrium (thin black arrow) between the gestational sac and endometrial cavity is noted. The posterior myometrium shows good wall thickness.
