We report the association of severe indeterminate colitis with cystic
fibrosis in a 21 year old woman, with mild pulmonary involvement, and
without digestive or pancreatic symptoms or pancreatic enzyme preparat
ion. Ten cases of inflammatory bowel disease associated with a cystic
fibrosis have been reported. Most fit with the diagnostic criteria of
Crohn's disease. Although this case was compatible with this diagnosis
, we have retained the diagnosis of ''severe indeterminate colitis'' b
ecause of the lack of specific histological features of Crohn's diseas
e. The association between inflammatory bowel disease and cystic fibro
sis is probably not fortuitous, although the pathophysiological link b
etween the two diseases is unknown.