Causes of non-healing of enterocutaneous fistula are all except:

Factors Preventing Spontaneous Fistula Closure High output (>500 mL/day) Severe disruption of intestinal continuity (> 50% of bowel circumference) Active inflammatory bowel disease of bowel segment Cancer Radiation enteritis Distal obstruction Undrained abscess cavity Foreign body in the fistula tract Fistula tract <2.5 cm long Epithelialization of fistula tract