Azzimondi G, Calbucci F, Rinaldi R, Vignatelli L, D'Alessandro R
Neurology Unit, S. Orsola-Malpighi Hospital, Bologna, Italy.
Neurosurg Rev. 1995;18(4):269-71. doi: 10.1007/BF00383879.
Arachnoid cysts in the region of the fourth ventricle are rarely reported. Two cases with intraventricular arachnoid cysts (one in the fourth and one in the right lateral) manifesting normal pressure hydrocephalus have been described in the previous literature. Here we report a clinically similar case in which the cyst was wedged in cerebellar vermis and compressed the fourth ventricle. Slow enlargement of the cyst could explain the clinical picture. The removal of the cyst resulted in a marked improvement of the symptoms despite the lack of significant changes in ventricular size.
第四脑室区域的蛛网膜囊肿鲜有报道。既往文献中曾描述过两例脑室内蛛网膜囊肿（一例位于第四脑室，一例位于右侧脑室）表现为正常压力脑积水的病例。在此，我们报告一例临床症状相似的病例，该囊肿嵌顿于小脑蚓部并压迫第四脑室。囊肿的缓慢增大可以解释临床表现。尽管脑室大小没有显著变化，但囊肿切除后症状明显改善。
