Et Tumor, Brute?

Et Tumor, Brute? is a side quest in Fallout: New Vegas.

Quick walkthrough
Note: If either of these two options are chosen, you can choose to cure him or rig the surgery to result in his death. If the latter is chosen, Speech 60 or Medicine 50 is needed to keep Lucius (and thus the Legion) friendly, so that you can still continue the Legion quest line.
 * 1) Cure Caesar
 * 2) Without a diagnostic scanning module, you'll need a doctor's bag and surgical tools, as well as Medicine 75 or Luck 9.
 * 3) Otherwise, you'll need to find a functional diagnostic scanning module and a doctor's bag.
 * 1) Finally, with Arcade Gannon as a follower, you also have the option of selling him into slavery as Caesar's personal doctor, but that will result in losing lots of Karma. In order to sell Arcade you have to leave him outside of Caesar's tent. Upon entering, talk to Lucius; he will ask you if you're sure you want to sell him.

Detailed walkthrough
If you choose to find the diagnostic scanning module, you must make your way towards the radiation and ghoul infested Vault 34. You can find the vault north-northwest of the NCR's Camp Golf or east of the NCR's Sharecropper Farms near New Vegas. It is recommended that you bring several Rad Away and Rad-X, as the entrance is brimming with radiation. Because of this, there will be several golden geckos on the way in and once entering the vault you'll find approximately 20-30 ghouls of various types inside.

Simply go to the room marked 'clinic'.


 * As you walk in take your first right to the stairway that will take you to the 'cafeteria'.
 * Fall down the hole, exit the room and turn left.
 * Follow the corridor (and signs for the 'clinic'), until you see the room marked 'clinic'.

The clinic contains a safe so you'll know you're in the correct room. The Auto-Doc is near the southeast side of the room.

Behind the scenes

 * The title of this quest is a play on Julius Caesar's famous last words,"Et tu, Brute?"from Shakespeare's play Julius Caesar which in English is "And you, Brutus?"
 * The quest is an elaborate allusion to Julius Caesar, who did indeed suffer from an ailment that caused severe headaches and was also a secret from the public.