20 of them showed fistulae of appendicular origin , 15 developed fistulae following various traumas of abdominal organs , 1 -- after intestinal ileus , in 3 cases fistulae were due to incarceration of hernia , in 17 cases external fistulae were applied in intestinal neoplasms .
C0016169
fistulae
C0423772
external fistulae