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Photograph of a transvaginal ultrasound scan that reveals a single intrauterine gestational sac within the uterine cavity at 10 weeks gestational age (8 weeks after fertilization). The growing fetus occupies most of the gestational sac at this stage in development, the head is very clearly distinguished from the torso (thorax and abdomen), the brain with ventricles and two hemispheres is visible, and arms with hands and legs with feet can often be appreciated.
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