MRI is useful for evaluating fistulas due to its high accuracy in classifying fistula types and detecting complications like abscesses. The document describes MRI protocols for fistula evaluation including tissue-sensitive sequences like T2, STIR and T1 post-gadolinium to characterize the fistula tract and assess inflammation. It is important to classify fistulas based on their relationship to the sphincter complex in order to guide appropriate surgical management and preserve continence. MRI allows detection of complex tracts and recurrent or multiple fistulas not obvious on examination alone.