An endoscope is a special medical instrument, not a common household item. During the surgery, an endoscope was used to view the patient's arteries.
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Non-Invasive
Endoscopes allow for internal viewing without requiring large incisions, considered a non-invasive method. Thanks to the endoscope, the doctor could diagnose the issue without large cuts.
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Medical Procedure
Using an endoscope is part of a procedure called an endoscopy; it's common in diagnoses. She had an endoscopy, where the endoscope revealed polyps in her colon.