An imaging study of the facial nerve XXXX .

@entity1 @entity9905 @entity389 @entity2103
UNASSIGNED: We conducted a prospective study to investigate the @entity2103 in @entity1 with @entity9905 by computed tomography (CT). Our study population was made up of 99 @entity1 -68 males and 31 females, aged 6 to 22 years (mean: 13.5)-who had unilateral @entity9905 without any @entity389 . We compared our findings in these @entity1 with those in 50 controls-33 males and 17 females, aged 5 to 22 years (mean: 15.0)-who had normal ears. We classified the @entity9905 @entity1 into three groups (A, B, and C) according to their Jahrsdoerfer grading scale score (>= 8; 6 or 7; and  <=5, respectively). The course of the facial nerve canal in both the controls and the study @entity1 was determined by temporal bone CT with multiplanar reconstruction. The distances from different parts of the facial nerve canal to surrounding structures were also measured. The course of the facial nerve canal in the normal ears did not vary much, and there were no statistically significant differences according to head side and sex. In groups B and C, the tympanic segment, mastoid segment, and angle of the second genu of the facial nerve canal were all significantly smaller than those of the controls (p < 0.01 in all cases). Statistically, the @entity2103 in @entity1 with @entity9905 was downwardly displaced. The mastoid segment of the facial nerve canal in these @entity1 was more anterior than that of the controls. We conclude that @entity9905 is often accompanied by @entity2103 , especially in the tympanic segment, the mastoid segment, and the second genu. We found that the lower the Jahrsdoerfer score was, the shorter the tympanic segment was and the more forward the mastoid segment was.
