A fistula probe is an instrument specially designed to be inserted through a fistula to identify the fistula tunnel1. It is used to investigate and diagnose colorectal fistula during exploration procedures2. The external opening of an anal fistula is usually easily seen on the skin around the anus. Finding the fistula’s internal opening inside the anal canal is more complicated. Knowing the complete path of an anal fistula is important for effective treatment1. One or more of the following imaging tests may be used to identify the fistula tunnel: MRI can map the fistula tunnel and provide detailed images of the sphincter muscle and other structures of the pelvic floor.
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