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SCIENTISTS HAVE long known that the brain can be harmed by extreme conditions such as high-altitude cerebral edema (HACE), in which blood vessels leak fluid into surrounding tissue, causing the brain to swell and press against the skull wall. But Fayed's scans are the first to indicate that brain damage can show up even in people who displayed no symptoms of altitude sickness during their climbs, or had just the usual nausea and lethargy familiar to any hiker in the mountains. And, disturbingly, it seemed to happen to climbers going not much higher than 15,000 feet.