ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Extra rib. Coloured frontal X-ray of a section through the chest of a 27-year-old patient with a right cervical rib. A cervical rib is a congenital extra rib arising from the seventh cervical vertebra. Here, it is causing problems as it presses on the scalene muscles of the neck.
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