ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
External ventricular drain. Frontal X-ray of the head of a 72-year-old man who has undergone neurosurgery (an operation on the brain). The X-ray shows the positioning of an external ventricular drain (arrowed) on the right side of his head, draining excess fluid from around his brain following the operation. This prevents elevated intracranial pressure due to a build up of cerebrospinal fluid (CSF). For a version of this image without arrow markers, see C038/8832.
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