noninvasive

[non-in-vey-siv]
adjective Medicine/Medical.
1.
not invading adjacent healthy cells, blood vessels, or tissues; localized: a noninvasive tumor.
2.
not entering or penetrating the body or disturbing body tissue, especially in a diagnostic procedure.

Origin:
1970–75; non- + invasive

noninvasively, adverb
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World English Dictionary
noninvasive (ˌnɒnɪnˈveɪsɪv)
 
adj
(of medical treatment) not involving the making of a relatively large incision in the body or the insertion of instruments, etc, into the patient

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

noninvasive non·in·va·sive (nŏn'ĭn-vā'sĭv)
adj.

  1. Not penetrating the body, as by incision. Used especially of a diagnostic procedure.

  2. Not invading healthy tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The video also displays a virtual colonoscopy, which scans the intestines with
  sophisticated, noninvasive imaging tools.
For patients who are not as sick, the panel recommended noninvasive imaging
  techniques.
Both treatments were developed at around the same time, but lithotripsy shot up
  rapidly because of its noninvasive nature.
Ultrasound is a simple, rapid, and noninvasive imaging technique.
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