Beau Biden, VP Joe Biden leave MD Anderson

NBC News confirms Beau Biden has mass on brain

HOUSTON - Vice President Joe Biden and his son, Beau, have left the MD Anderson Cancer Center after the younger Biden underwent  medical testing in Houston.

The Biden's caravan departed the Medical Center just after 10 a.m. Thursday for Ellington Field.

Beau Biden gave a thumbs up and jumped into an SUV behind his dad. We caught the vice president giving a thumbs up to the camera on the way out of Houston.

Beau Biden sent out a tweet Thursday morning before leaving the hospital.

"One our way home! Can't wait to get back. Thank, Houston," tweeted @BeauBiden.

Any plans for treating Beau Biden will be on hold until doctors have a definitive diagnosis.  Biden's doctors will continue to watch him carefully over the coming weeks.

'Successful procedure'

Vice President Biden released a statement Wednesday about his son's trip to Houston:

"Yesterday (Tuesday) our son Beau underwent a successful procedure. He is in great shape and is going to be discharged tomorrow (Thursday) and heading home to Delaware. He will follow up with his local physicians in the coming weeks."

Beau Biden, the Delaware Attorney General, has been seeing doctors at MD Anderson since Monday after hospital visits last week in Chicago and Philadelphia.

Last Wednesday, the 44-year-old Biden reported feeling weak and disoriented during a family vacation in Indiana.

NBC News Chief Medical Editor Dr. Nancy Snyderman released the following information Wednesday morning:

"Sources familiar with Beau Biden's condition, though not his doctors, tell NBC News that he has a mass in his brain, which is why he needed to remain at the M.D. Anderson Medical Center in Houston for more tests. Among the tests being conducted is a biopsy.  It is unlikely that we will know the results for a few days.  The biopsy tissue must be reviewed under a microscope to make the correct diagnosis and then organize a treatment plan. 

"To be clear, a mass is anything in the brain that takes up space such as an aneurysm, an infarction or a hemorrhage. It can include a tumor but does NOT mean cancer until proven."

Beaue Biden suffered a mild stroke in May of 2010. He was hospitalized for a week then and spent more than a month at home recuperating.

"Stroke was the farthest thing from my mind when I went in," Biden said at that time.

His father has had health scares of his own, including a life-threatening brain aneurysm in 1988, when he was 45.

The White House said the vice president had been home in Delaware for the past several days before accompanying his son to Houston. It's not clear how long the vice president will stay.

Vice President Biden had been scheduled to join Obama in Scranton, Pa., later this week during Obama's two-day bus tour.

Copyright 2013 by The Associated Press contributed to this report. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.