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Something in a CAT scan might explain a coma, but it is not a definitive test. Just because a computer "looks normal" that is no indication that it will run. This is a crude analogy. The CAT scan images tissues. It does not evaluate how those tissues are operating - or not. Though there are a few "clues" to what is going on in a CAT scan, the scan is not the "litmus test" for actual brain operation and function. A CAT scan may be performed as part of the workup to find out why someone is in a coma. It will allow the physicians to determine if there is a "physical" cause or not. If nothing shows up, the cause of the coma must be investigated further. A coma can be a difficult thing to find a cause for.

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