The Boston University student who suffered a serious brain injury in a car accident that left three other students dead in New Zealand last month has returned to the United States and is being treated at Massachusetts General Hospital, a hospital spokesman said today.

Meg Theriault, 21, of Salisbury, left New Zealand on Wednesday on a medi-flight to Boston. Since the crash, she has undergone brain surgery and come out of a coma.

The Massachusetts General Hospital spokesman said he can not release information about Theriault’s condition without the consent of her family.

Another BU student, Stephen Houseman, was driving the van and was also injured in the crash.

On Tuesday, he pleaded guilty to all counts, which could have landed him 21 months in jail. But the judge handed Houseman the minimum penalty: a six-month driving ban in New Zealand and $941 in court costs.

On Wednesday, Theriault’s parents said the families of the students in the crash “continue to support each other as we move forward.” Todd and Deb Theriault also said in a statement that once she has fully recovered, Meg plans to return to campus to complete her degree, then to New Zealand to personally thank the doctors who treated her.

“We know in our hearts that Meg will work to heal and return to finish her studies at Boston University,” the Theriaults said.