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(a) Sagittal and (b) transverse images from a pelvic ultrasound show a gravid retroflexed uterus measuring 12.4 × 6.5 × 7.1 cm corresponding to a volume of 299.3 cc. (c, d) Additional transabdominal images show a single intrauterine gestation with positive fetal cardiac activity measuring 159 beats per minute and a crown-rump length measuring 2.1 cm corresponding to an estimated gestational age of 8 weeks and 5 days
