Henriques José Gilberto de Brito, Pianetti Filho Geraldo, Henriques Karina Santos Wandeck, Fonseca Luiz Fernando, Melo Renato Pacheco de, Silva Márcia Cristina da, Malheiros José Augusto
Hospital das Clínicas, Federal University of Minas Gerais, Rua Araguari 1045/301, Belo Horizonte, MG, Brazil.
Arq Neuropsiquiatr. 2007 Dec;65(4A):1034-6. doi: 10.1590/s0004-282x2007000600025.
Arachnoid cysts (AC) are extra-cerebral cerebrospinal fluid collections of unknown origin. They correspond to 1% of all intracranial nontraumatic space-occupying lesions and appear more frequently in the middle fossa (50%). More than 25% of these cysts are incidental findings and the majority of patients are asymptomatic. Seizures, intracranial hypertension signs, neurological deficits, macrocrania, developmental delay and bulging of the skull are the main signs and symptoms of the lesion. AC rupture and bleeding are rare, usually occurring in young adults and associated with trauma. The risk of hemorrhage does not exceed 0.04% / year. We describe the case of a ten-year-old boy who presented with acute signs of intracranial hypertension secondary to a spontaneous acute subdural hematoma, contralateral to an AC of the middle fossa. Three factors were significant in this case: signs and symptoms occurred spontaneously; the presence of an acute subdural hematoma exclusively contralateral to the AC; successful outcome of the conservative treatment.
蛛网膜囊肿（AC）是起源不明的脑外脑脊液聚集。它们占所有颅内非创伤性占位性病变的1%，在中颅窝出现的频率更高（50%）。这些囊肿中超过25%是偶然发现的，大多数患者无症状。癫痫发作、颅内高压体征、神经功能缺损、巨头症、发育迟缓及颅骨膨出是该病变的主要体征和症状。AC破裂和出血罕见，通常发生在年轻人中且与创伤有关。出血风险每年不超过0.04%。我们描述了一名10岁男孩的病例，该男孩因中颅窝AC对侧的自发性急性硬膜下血肿出现颅内高压的急性体征。该病例中有三个因素很重要：体征和症状自发出现；急性硬膜下血肿仅出现在AC的对侧；保守治疗取得成功。
