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Brown Syndrome in one Pair of Dizygotic Twins

机译：一对同卵双胞胎中的布朗综合症

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Introduction: Brown syndrome is a rare ocular movement abnormality. This syndrome ischaracterized by an inability to elevate the affected eye in adduction. Most cases are sporadic butthe occurrence in Monozygotic twins has suggested the possible autosomal dominant inheritancein Brown syndrome.Case presentation: A 4-year-old girl (one pair of dizygotic twins) was referred to our pediatricophthalmology clinic to assess her abnormal eye movement noticed by her mother. Visual acuityof both eyes was 20/20 with Snellen chart. Ocular motility showed mild exotropia in primaryposition with marked divergence in upward gaze (V pattern), mild hypotropia in adduction, andlimitation of elevation in adduction of both eyes (Fig. 1A). We also examined her sister, all ocularevaluations including visual acuity, slit lamp examination, funduscopy and ocular motility (Ductions& Versions) were normal without any limitation.We also review the related articles that previously have reported Brown syndrome in twins.Conclusion: Although there are few case reports of Brown syndrome in twins, combination ofthese reports may elucidate the genetic basis of this disease.
机译：简介：布朗综合征是一种罕见的眼动异常。该综合征的特征是无法升高患眼内收。多数病例为偶发性，但单卵双胎的发生提示可能是布朗综合征的常染色体显性遗传。病例介绍：一名4岁女孩（一对双卵双胞胎）被送往我们的儿科眼科诊所评估其异常眼动她妈妈。根据Snellen图，双眼的视力为20/20。眼球运动表现为轻度外向性为主位，向上凝视明显发散（V型），内收度为轻度低视，双眼内收度有限（图1A）。我们还检查了她的姐姐，所有视力评估包括视力，裂隙灯检查，眼底镜检查和眼球运动（Ductions和Versions）均正常，无任何限制。我们还回顾了先前报道双胞胎布朗综合征的相关文章。很少有双胞胎布朗综合征的病例报道，这些报道的结合可以阐明这种疾病的遗传基础。

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