fistula
noun [ C ] medical specialized uk/ˈfɪs.tʃə.lə/ us/ˈfɪs.tʃə.lə/
瘘，瘘管
an abnormal opening or passage from one organ to another or from an organ to the skin surface
an anal fistula 肛瘘
Gas in the bladder may be related to a fistula between the bladder and the colon. 膀胱气肿可能与膀胱和结肠之间形成瘘管有关。