A<unk>  occurs when the colon or rectum deviates anteriorly. This leads to the formation of an abnormal connection between the rectum and the vulval vestibule, immediately posterior to the hymen, so that an ectopic anus opens into the fourchette, or frenulum, of the labia minora. A common wall is shared between the rectum and vagina above the site of the fistula. Although the opening of the rectum into the anal canal is shorter and narrower than normal, the rectum itself is completely normal.
Rectovestibular fistula
Vestibular adenitis
Vulvar vestibulitis
Oculoauricular syndrome
Nasal vestibulitis
Ophthalmodynia periodica
Labyrinthine fistula
Transient lingual papillitis