Assessing tumour blood supply before surgery.

Yesterday, I underwent a cerebral angiogram procedure. My neurosurgeon requested this to verify blood flow to/from the tumour in my brain. He recently told my wife & I that this tumour has a robust blood supply.
The procedure involves the insertion of a catheter into the femoral artery at the top of the leg. A long, thin flexible tube is gently pushed up through the main artery of the abdomen & chest, all the way to the carotid artery of the neck. A contrast dye provides the info the team needs.
I expected some pain (especially since I declined any sedative), but I was surprised this 45 minute procedure was pain free. Being wheeled into the surgical room was more intimidating than anything. My wife & I expect to be notified of the brain surgery date relatively soon.