Et Tumor, Brute?

Et Tumor, Brute? is a quest in Fallout: New Vegas which involves removing Caesar's Brain Tumor.

Quest Summary
Caesar Needs You to get the supplies to cure his Headaches. You will need to find A Functional Diagnostic Scanning Module or buy a set of surgical tools (however high medicine level is needed to operate Caesar manually).

Your objective for this quest is to find the Diagnostic Scanning Module in Vault 34. Getting in and back out of the Vault in this game is difficult for a variety of reasons. 1) Much like Fallout 3's Vault 87, the entrance is brimming with radiation. 2) As a possible result of the intense radiation, you'll find approximately 20-30 ghouls of various types inside. Difficult, yes, but the Vault does offer some other rewards in the form of semi and automatic rifles, sniper rifles, a block of C4, a mini gun, a rocket launcher, energy weapons, and grenade launchers to be obtained in the Overseer's quarters. Accessing the Overseer's rooms requires 2 pass codes that you can get from 2 dead scientists, now Ghoulified, that can be found submerged inside the Vault.

Guide for part 1

The first step you should undertake before attempting to enter Vault 34 is to be cured of all your radiation, because that thing is hotter then an Arizona summer. Once free of all RADs you can find the vault north of the NCR's Camp Golf or west of the NCR's Sharecropper farms near New Vegas.