What is the procedure for examining a cavity in the body using an endoscope?

The procedure for examining a cavity in the body using an endoscope is known as endoscopy. This technique involves the use of a thin, flexible tube equipped with a camera and light, allowing healthcare professionals to visualize internal organs and cavities directly. Endoscopy is a crucial tool in diagnosing and sometimes treating conditions within various body caverns, such as the gastrointestinal tract, respiratory tract, and others.

Endoscopy provides real-time images and can also allow for interventions, such as biopsies or removal of suspicious lesions, making it a versatile and valuable procedure in medical diagnostics. Other methods listed, such as colonoscopy, are specific types of endoscopy focusing on the colon. Therefore, while colonoscopy is indeed a form of endoscopy, the broader term "endoscopy" encompasses all procedures for examining internal cavities using an endoscope.

Ultrasound and radiography, while useful imaging techniques, do not involve direct visual examination with a scope and are not performed using an endoscope. Thus, they do not fit the description of the procedure outlined in the question.