In medicine, evacuation was the process of emptying a body cavity of accumulated fluid or tissue.

In 1986, the standard treatment for a epidural hematoma was its evacuation, a procedure which involved the drilling of holes in the patient's skull to release the pressure. That year, Doctor Leonard McCoy was aghast that a doctor at Mercy Hospital would suggest that course of treatment for Pavel Chekov. (Star Trek IV: The Voyage Home)

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