In small setback, fluid buildup keeps Giffords in ICU

>>> we turn to the latest now on congresswoman gaby giffords two weeks since she was wounded in that shooting rampage in houston . janet shamlian in houston for us. good evening.

>> reporter: hi, lester a small setback for gabrielle giffords tonight, she may not make it out of inten sive care this week. doctors say she has a buildup of fluid on her brain and while that is not unexpected, it does need to be watched. gaby giffords will remain in the trauma unit of the houston hospital longer than planned, but her rehabilitation hasn't been affected. her husband, astronaut mark kelly , messaging on twitter today, "gabrielle start hearse second day of rehab in 20 minutes at memorial herman. no weekends off for here." for now, a buildup of fluid in her brain is keeping giffords in the hospital's intensive care unit . doctors say the buildup has eased some over the weekend, a good sign.

>> little fluid collection that the doc there is put a drain into around her brain and that drain is still in place. with that drain in place, she can't leave the icu.

>> reporter: experts say the fluid is an expected side effect from a brain injury such as giffords and the temporary drain could stay in place as she recovers.

>> it is not uncommon at all to have someone with a drain for several weeks and then what we do is that we try to ween the patient off of this drain, again, by draining less frequently and trying to assess whether or not the brain is capable itself of reabsorbing the fluid.

>> reporter: when giffords moves to the rehab sent they are room will become her work space. doctors are working with giffords on standing up with help. with a breathing tube in, she suspect able to talk but they believe she is trying to form words and communicate. therapists say that each day, they are asking giffords for a little bit more and they are very pleased with the progress she has made in just three days here in houston . lesser?

>> janet shamlian , thank you.