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What causes a fistula? After an abscess has been drained, a passage may remain between the anal gland and the skin, resulting in a fistula. If the gland does not heal, there will be persistent drainage through this passage. If the outside opening of the fistula heals first, a recurrent abscess may develop.
Even though the fistula is not directly on or within the brain, it can lead to brain dysfunction by congesting the brain venous system, interfering with normal brain circulation. Etiology (why fistulas happen). The reason brain dural fistulas form is usually unclear.