This is the alternative to traveling to Vault 34 and recovering a diagnostic scanning module.
This item is used to operate on Caesar's brain tumor. It must be used in conjunction with a doctor's bag. It can be bought at New Vegas Medical Clinic for 999 caps, or stolen from the same place if the player wishes to save the money.
Surgical tools can only be bought at the New Vegas medical clinic. Surgical tools may also be acquired by entering the clinic, entering the room directly adjacent to it, and stealing from the first aid box on the stretcher (for those of you unwilling to shell out the 999). The surgical tools won't spawn in the first aid box or in Doctor Usanagi's vendor inventory until the quest Et Tumor, Brute? has begun.