Transabdominal obstetrical ultrasound showing fetus developing within the amniotic sac.
Head Circumference and Biparietal Diameter (Courtesy of Dr. W. Whittle)
Femur Length (one end of the femur is not visible) (Courtesy of Dr. W. Whittle)
Transvaginal ultrasounds showing an ectopic pregnancy (left) and a normal intrauterine pregnancy (right). In the image on the left, the uterus is empty, and there is a fetus located in the pelvis (arrow). In the image on the right, a fetus is seen developing within...
Crown-Rump Length (Courtesy of Dr. W. Whittle)
