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into court today. jared loughner pleaded not guilty to federal charges that he tried to assassinate congresswoman giffords and two of her aides and while loughner was in court in arizona, giffords continued her long and hard road back in houston. tonight bob woodruff has the latest from the hospital. >> reporter: silence today at memorial hermann hospital in houston in wake of the announcement this weekend that congresswoman giffords had suffered her first setback. fluid on the brain. the accumulation of fluids in the brain occurs when a bullet penetrates the skull making the brain bleed or swell. to remove the excess brain fluid doctors have likely inserted a drain into a hole in her skull. >> pressure built up perhaps too quickly for the brain to accommodate, which could cause what we call herniation, and that could mean a very rapid demise. >> reporter: it could be a couple of weeks before doctors determine if this is a temporary accumulation of fluid or if it is more serious, requiring a permanent shunt to drain fluid. this is not uncommon for someone suffering this kind of wound from a gunshot or explosion on