<正> Our results are impressively similar in many ways to the 51% positive incidence of PLF at exploration at the University of Iowa reported by Seltzer and McCabe. The results are very different, both in incidence and cure rate, from the 93% vertigo cure rate of Healy et al, and from the 86% incidence and 80% vertigo cure rate Potter and Conner. We certainly envy their cure rates, but each of these