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Surgery General bac5a6f2

True about goodsall rule?

A
To know about likely position of external opening of fistula in ano
B
Posterior located external openings are joined by straight line
C
Not valid if external opening >3cm away from anal verge
D
Not valiod in Single external opening
High-Yield Explanation
Goodsall rule is to know internal opening of fistula in ano.

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