Endoscopy

n. examination of internal cavities by means of an endoscope (Medicine)

Endoscopy means looking inside and typically refers to looking inside the human body for medical reasons using an instrument called an endoscope. Endoscopy can also refer to using a borescope in technical situations where direct line-of-sight observation is not feasible.
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Endoscopy /en·dos·co·py/ visual examination by means of an endoscope.endoscop´ic peroral endoscopy examination of organs accessible to observation [more]Endoscopy - Community and Resources

Noun
1. visual examination of the interior of a hollow body organ by use of an endoscope
(hypernym) examination, scrutiny
(hyponym) celioscopy

(n.)
The art or process of examining by means of the endoscope.