used to form nouns referring to a medical examination inside a particular part of the body, usually using a small camera or similar device

Colonoscopy is a procedure that enables a doctor to evaluate the inside of the colon. 肠镜检查可以让医生对结肠内部进行评测。

It would help if John had an arthroscopy to look inside his knee to try to determine the problem. 如果约翰能做一个关节镜检查看一下他膝关节内部，就有助于确定是什么问题。