Trépanation labyrinthique et malformation congénitale

: Labyrinthine trepanation was performed in the majority of 16 patients with minor agenesis of middle ear involving either stapedovestibular ankylosis or absence of fenestra vestibuli. Preoperative findings are discussed, as well as the prevention and treatment of labyrinthine geysers and the possibility of obtaining a functioning labyrinthine opening. Results were good in simple cases but poorer in more complex lesions, for which the indication for use of this procedure is debatable.