ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Obstetric pelvic measurements. Coloured sagittal computed tomography (CT) scan of a 25-year-old woman who is in her first pregnancy. The scan and the dotted line are part of measurements taken to assess the width of the pelvis and the feasibility of a normal birth, or whether a caesarean section may be needed to deliver the baby.
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