Endoscopy

Endoscopy means looking inside and typically refers to looking inside the body for medical reasons using an instrument called an endoscope.

Endoscopy is a minimally invasive diagnostic medical procedure that is used to assess the interior surfaces of an organ by inserting a tube into the body. The instrument may have a rigid or flexible tube and not only provide an image for visual inspection and photography, but also enable taking biopsies and retrieval of foreign objects.

See Wikipedia, Endoscopy.