UPDATE Aug. 22 — Vice President Joe Biden and his son, Beau, departed M.D. Anderson Cancer Center Thursday morning, along with both of their spouses. The Bidens flew out of Ellington Field on Air Force 2 and headed to Delaware. "On our way home! Can't wait to get back. Thank you, Houston," Beau Biden tweeted Thursday just before 11 a.m., and included a photo of the foursome.

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Beau Biden — Delaware attorney general and son of vice president Joe Biden — underwent a successful medical procedure at M.D. Anderson Cancer Center on Tuesday, according to a statement released from the White House.

The vice president and his wife Jill say their 44-year-old son is in "great shape" and will return home Thursday, after which he will check in with his local doctors in Delaware. The statement provides no further details on the surgery.

The younger Biden arrived in Houston on Monday following a recent spell of weakness and disorientation during a family vacation in Indiana. After being admitted to Chicago's Northwestern Memorial Hospital last week, he followed up with a Philadelphia hospital before deciding to make his way to the Texas Medical Center.

NBC News reported Wednesday morning that doctors discovered a mass on the attorney general's brain. Sources close to the Bidens confirmed that a biopsy was performed, the results of which are expected to take several days.

According to the Associated Press, the vice president canceled Thursday appearances in Maine and Rhode Island to remain with his son.