瘘，瘘管由于受伤、疾病或先天性变形引起的把脓肿、腔洞或空器官同身体或其它空器官连结起来的病变的通道

An abnormal duct or passage resulting from injury, disease, or a congenital disorder that connects an abscess, a cavity, or a hollow organ to the body surface or to another hollow organ.

内窥镜，内视镜一种目测检查身体通道或中空器官，如结肠、膀胱或胃的内部的仪器

An instrument for examining visually the interior of a bodily canal or a hollow organ such as the colon, bladder, or stomach.