[Rare fistulation in enterocolitis regionalis (Crohn's disease) (author's transl)].

The transmural inflammation in Crohn's disease, the variable localization of the disease and the tendency to a descending spread, all lead to a multitude of possible fistulae, the presence of which is often difficult to demonstrate. This is a report on 5 unusual fistula systems: in 2 cases entero-enteral (one of which with hydronephrosis), 1 case of rectovaginal fistula, 1 case of a branched fistula system in the right buttock, 1 case of fistulae between an abscess system in the spleen "bed" and the greater curvature of the stomach. A radiological and endoscopic diagnosis is important since surgically opened fistula systems heal only with great difficulty or not at all.