Placenta Previa

Placenta (P) covers the os. Crosses (+) approximate the cervical length and the bladder (B) is seen on the right. (Courtesy of Dr. Seaward and Dr. Ryan, Mt Sinai Hospital)

Head

Head Circumference and Biparietal Diameter (Courtesy of Dr. W. Whittle)

Femur

Femur Length (one end of the femur is not visible) (Courtesy of Dr. W. Whittle)

Ectopic Pregnancy

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...