Diagnostic and therapeutic problems of non perianal fistulas and abscesses in Crohn's disease.

Problems related to the appearance of non perianal fistulas and abscesses are examined in a series of 204 patients operated on for Crohn's disease. Incidence of these complications was 34.3% (70 cases); one or more fistulas were present in 54 patients, associated with abscesses in 13, while abscesses alone were present in 3. The highest incidence was observed in the male sex, in patients over 50 years, and in the presence of stenosing Crohn's lesions (P less than 0.001). On the contrary, the primary site of Crohn's disease does not seem to affect significantly their appearance. The clinical suspect of fistulas or abscesses should be supported with radiographic, endoscopic, echographic and scintiscan findings, even though about 7.2% of fistulas are diagnosed only intraoperatively. Surgical treatment is the most suitable therapeutic management; however enteroenteric and mesenteric fistulas are only relative indications for surgery. TPN is suitable for postoperative enteric fistulas (5 cases). Postoperative morbidity is not different in patients with or without such complications at surgery. Long-term prognosis of non perianal fistulas and abscesses is related only to recurrences of Crohn's disease and their anatomopathologic evolution.