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¡¡¡¡Abstract£º¡¡Objective To investigate microscopic anatomy of suboccipital retrosigmoid keyhole approach via the petrosal fissure and cerebello-pontine fissure. Methods The simulate operation was performed on 30 wet cerebral hemispheres of 15 cadaver heads. After a transverse ( longitudinal) incision and a 2. 5-3. 0 cm bone window, the measurements were made for the changes of surgical fields and exposure of trigeminal, glossopharyngeal and facial-acoustic nerves before and after the dissociation of the petrosal fissure and cerebello-pontine fissure. The petrosal fissure, upper and lower branches of cerebello-pontine fissure, petrosal vein, cerebellar arteries, and trigeminal, glossopharyngeal and facialacoustic nerves were also measured and photographed after the dissociation of cerebello-pontine fissure. Results An area from the tentorial edge to the jugular tuberculum of foramen magnum, and medial to lateral sides of pons and midbrain was fully exposed by dissociation of cerebello-pontine fissure with a statistical significance comparing with the classical retrosigmoid approach. Conclusion The new approach established in this study extends the application of the classical retrosigmoid approach with advantages of small incision, less brain damage and slight pull of epencephalon, and provides a more efficient operation for lesions of the cerebellopontine angle.
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