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Horseshoe fistula is one of the most. complex and potentially morbid. conditions faced in a modern anorectal. surgery. Hanley, 1965 reported his. original procedure for horseshoe fistula. which involved complete division of the. posterior 12 o'clock sphincter mechanism.
lip pits (congenital lip fistulas), n.pl the congenital depressions, usually bilateral and symmetrically placed, on the vermilion portion of the lower lip. These pits may be circular or may be present as a transverse slit. The depression represents a blind fistula that penetrates downward into the lower lip to a depth of 0.5 to 2.5 cm. They often exude viscid saliva on pressure.