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首页> 外文期刊>Japanese Journal of Ophthalmology >Incarceration of the inferior oblique muscle branch of the oculomotor nerve in two cases of orbital floor trapdoor fracture.
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Incarceration of the inferior oblique muscle branch of the oculomotor nerve in two cases of orbital floor trapdoor fracture.

机译：动眼神经下斜肌分支嵌顿在2例眼眶底板活板骨折中。

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摘要

BACKGROUND: Incarceration of the inferior oblique muscle (IO) branch of the oculomotor nerve may occur in cases of orbital floor trapdoor fracture. CASES: Two orbital floor trapdoor fracture cases, with lesions located just outside of the inferior rectus muscle but without its incarceration, were examined pre- and postoperatively for visual acuity, intraocular details, the nine diagnostic ocular positions of gaze, binocular single vision field with the Hess chart, and by computed tomography (CT). One case was also examined by magnetic resonance imaging (MRI; T1-weighted images). A forced duction test was conducted intraoperatively. OBSERVATIONS: Each case presented good visual acuity and neither globe showed any injury. Motility disturbance of the IO was shown in each case by binocular single vision field testing and the Hess chart. The possibility of the incarceration of the IO branch of the oculomotor nerve, which runs from the incarcerated lesion to the superior belly of the IO, in an orbital floor trapdoor fracture was shown on CT and MRI. Intraoperative forced duction testing revealed a restriction due to the incarceration of the connective tissue septa. CONCLUSIONS: As inferred from the CT and MRI analyses conducted in this study, IO palsy may be one of the causes of ocular motility disturbance of the IO in an orbital floor trapdoor fracture, in addition to the ocular motility disturbance due to the connective tissue septa. Jpn J Ophthalmol 2005;49:246-252 (c) Japanese Ophthalmological Society 2005.
机译：背景：动眼神经下斜肌（IO）分支的嵌顿可能发生在眶底陷门断裂的情况下。案例：术前和术后检查了两个眶底活板骨折病例，病变位于直肌下肌外侧，但没有嵌顿，在手术前后检查了视力，眼内细节，凝视的九个诊断眼位，双眼单视野Hess图表，以及计算机断层扫描（CT）。还通过磁共振成像（MRI; T1加权图像）检查了一个病例。术中进行强制引产测试。观察：每个病例均具有良好的视敏度，两个球体均未显示任何伤害。通过双眼单视野测试和Hess图表显示了每种情况下IO的运动障碍。 CT和MRI显示了眼眶动神经的IO分支嵌顿在眶底陷门骨折中的可能性，该分支运动从嵌顿的病变延伸到IO的上腹部。术中强迫诱导测试显示由于结缔组织隔隔的嵌顿而受到限制。结论：根据本研究的CT和MRI分析可知，IO麻痹可能是眶底陷门骨折的IO眼动障碍的原因之一，此外结缔组织间隔引起的眼动障碍。 Jpn J Ophthalmol 2005; 49：246-252（c）日本眼科学会2005。

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