Cerebellar retraction and @entity393 after microvascular decompression for XXXX .

@entity1 @entity393 @entity2473 @entity1649
BACKGROUND: This retrospective study evaluated the length of cerebellar retraction and the changes of intraoperative brainstem auditory evoked potential (BAEP) during microvascular decompression (MVD), and assessed the predictive value of the @entity393 as a prognostic indicator for the treatment outcome of @entity1649 ( @entity1649 ). METHODS: This series included 1,518 consecutive @entity1 affected with @entity1649 who underwent MVD, during which BAEP was monitored. @entity1 were divided into two groups based on whether @entity393 occurred following decompression or not. Each @entity1 underwent a similar procedure performed by one neurosurgeon. The two @entity1 groups were matched with regard to sex, age, and degree of @entity2473 . RESULTS: Among the 1,518 @entity1 , 106 (6.98  %) displayed functional hearing changes. @entity393 was permanent in 12 @entity1 (0.79  %). Of the 1,412 @entity1 with stationary hearing compared with preoperative audiometry, 96 @entity1 were selected who were individually matched with respect to sex, age, and degree of @entity2473 . BAEP changed immediately after cerebellar retraction in 7 of 12 @entity393 @entity1 , suggesting the importance of retraction on hearing outcomes. The distance from the cerebellar surface of the petrous temporal bone to the neurovascular compression point was measured. The median distance of cerebellar retraction in the @entity393 group was 13.77  mm, which was longer than the median distance in the control group. CONCLUSIONS: Preoperative measurement of the cerebellar retraction distance can be a valuable clue to predict and prevent postoperative @entity393 in MVD for @entity1649 .
