Table 3 St James’s University Hospital classification
Fistula type | Course of the perianal fistula |
|---|---|
Grade I | A simple inter-sphincteric fistula without any secondary tract/ramification or abscess |
Grade II | An inter-sphincteric fistula associated with secondary tract/ramification or abscess |
Grade III | A trans-sphincteric fistulous tact without any secondary tract or abscess |
Grade IV | A trans-sphincteric Fistulous Tract Along Associated with Secondary tract/ ramification or abscess |
Grade V | Any fistulous tract with supralevator or translevator extension |