Factors associated with surgery in patients with intra-abdominal fistulizing Crohn's disease

Table 1 Demographic, clinical and radiographic characteristics of study cohort n (%)

Number of patients	132
Male	79 (60)
Age at diagnosis	24 (11.6)
Age at time of imaging	31.3 (12.2)
Time from diagnosis to imaging, month, mean ± SD	87 (84)
Penetrating disease at presentation	28 (21)
Previous surgery1	15 (11)
Imaging before 2010	66 (50)
Treatment during fistula presentation2
No IM or anti-TNF	70 (53)
Only IM	33 (26)
Only anti-TNF	11 (8)
Anti TNF + IM	12 (9)
Radiological features
Total no. of fistulae	193
Anatomy of fistulae
Entero-enteric fistula	103 (52)
Entero-colonic fistula	35 (18)
Entero-cutaneous fistula	28 (14)
Entero-vesical fistula	15 (8)
Entero-soft tissue fistula	12 (6)
No. of fistulae per patient
One fistula	72 (55)
Two fistulae	49 (37)
Three or more fistulae	11 (8)
Additional radiological features, n± SD (%)
Diameter of inflammatory conglomerate (cm)	10 ± 2.6
Length of diseased bowel segment (cm)	14.8 ± 17.5
Stricture	31 (23)
Abscess	45 (34)
Prominent lymphadenopathy	40 (30)
Treatment after fistula presentation
No IM or anti-TNF	54 (47)
Only IM	28 (25)
Only anti-TNF	19 (17)
Anti TNF + IM	12 (11)

¹Patients who had surgery within 6-mo prior to index imaging were excluded. All previous surgeries included resection of bowel;

²Detailed treatment characteristics available for 126 patients. IM: Immunomodulators; TNF: Tumor necrosis factor.