Brain tumour biopsy...any insights welcome

Hi,

My uncle found out last Thursday that he has a brain tumour. 

He's having a biopsy today as a day case patient. He hasn't been given any other information about the procedure so doesn't know if he'll be awake or asleep or how long people generally have to stay afterwards. 

Has anyone got any insights into this process they wouldn't mind sharing?

Thanks in advance x