Et Tumor, Brute?

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

Synopsis
Caesar has been experiencing intense headaches and blackouts more frequently as of late and asks for diagnosis and treatment of his ailment.

Walkthrough

 * 1) Find a way to cure Caesar's brain tumor.
 * 2) Perform surgery using the Auto-Doc in Caesar's tent after repairing it with the installation of an automatic surgical unit found in Vault 34 clinic.
 * 3) A Medicine skill of 75 or a Luck of 9 can be used to perform the surgery yourself. This option will require a doctor's bag and surgical tools bought from the New Vegas Medical Clinic.
 * 4) Sell Arcade Gannon into slavery as Caesar's personal doctor.

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?" in relation to Brutus' hand in Caesar's assassination.
 * If giving Arcade away as a slave, the Courier says "The world needs Caesar more than it needs you." Arcade responds "Victrix causa diis placuit sed victa Catoni" which can be translated as "the winning cause pleased the gods, but the losing cause pleased Cato." This is a quote from the Latin poem Pharsalia by Lucan, in which the historical figure of Caesar is portrayed as the main antagonist, and the main hero, the historical figure of Cato Uticensis, is eventually forced to commit suicide, being unable to defeat Caesar.
 * 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. Caesar's headaches were more likely to have been caused by a motor function disorder, causing him to fall regularly ("falling sickness").