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A fistula (plural: fistulae or fistulas) is an abnormal connection between two epithelial surfaces such as between hollow organs, skin or vessels. Conventionally, the name of a specific fistula type is a combination of the two organs. For discussions of specific fistulae please refer to individual articles.
The formation of a fistula may be referred to as fistulation or fistulisation, both terms are equally valid 2.
A wide variety of etiologies are implicated:
Various types of fistula have been described, please keep these lists in alphabetical order:
head and neck
History and etymology
From the Latin, fistula means tube or pipe 1.