[Microscopy and endoscopy of the cerebellopontine angle in the retrosigmoid approach]

The retrosigmoid approach is one of the ways to the cerebellopontine angle. It's simple to perform and offers a good view in this difficult to reach area. It's a way to surgical cure of vertigo, microvascular compression syndromes and some kinds of acoustic neuromas. The operating microscopes is a basic tool of the surgeon in otoneurosurgery. For last few years straight rigid microscopes were introduced to have a better visualization without cerebellar mechanical retraction. They are useful complementary tools to existing methods. The authors present their experience on cadaver studies.