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Keywords: Heartbeat at 5 weeks 1 day.gif Transvaginal ultrasound showing a gestational sac whose fluid is displayed as darker with an embryo in its upper left part with a visible heartbeat The size of the embryo is measured to be 1 6mm and the mean gestational sac diameter 8 8mm conferring a gestational age of 5 weeks and 1 day The larger structure seen in the gestational sac is the yolk sac own Mikael Häggström 2014-07-21 Animated ultrasonography of human embryo Vaginal ultrasonography Cc-zero |