Abnormal connection between the anal canal and the perianal skin
Aetiology
- Majority arise from delayed/inadequate treatment of anorectal abscesses
- Patient may have Crohn’s, carcinoma or TB as an underlying pathology
Clinical presentation
- Painful tender swellings
- Discharge onto the perineum, including mucus, blood, pus, or faeces
Investigations
- EUA of anorectum
- Proctoscopy to visualize the opening of the tract
- MRI can be used in complex fistula
Management
- Surgically excised then drained
- Followed up with antibiotics
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