Gerstl Jakob V E, Aquilina Kristian, Florman Jeffrey E
University College London Medical School, London, United Kingdom.
Department of Neurosurgery, Great Ormond Street Hospital for Children, London, United Kingdom.
J Neurosurg Case Lessons. 2021 Apr 12;1(15):CASE2121. doi: 10.3171/CASE2121.
Colloid cysts of the posterior third ventricle are exceedingly rare. This location is a high-risk zone for colloid cysts because of potential obstruction of the cerebral aqueduct.
The authors report a case of a 57-year-old man who presented with a 6-month history of progressive headache, short-term memory loss, visual blurring, and an episode of double vision. Magnetic resonance imaging (MRI) revealed a colloid cyst, 22 mm in diameter, attached to the roof of the posterior third ventricle. The posterior third ventricle was obstructed, but both foramina of Monro were patent. The entirety of the cyst was resected via a right frontal parasagittal, interhemispheric, transventricular approach through the foramen of Monro. It was not contained within the velum interpositum. The patient did not experience any postoperative deficits.
This case supports the theoretical evidence that colloid cysts in the posterior zone of the third ventricle pose a risk for obstructive hydrocephalus. This report of a large cyst in a rare location describes a unique lesion and provides the first published MRI description.
第三脑室后部的胶样囊肿极为罕见。由于存在阻塞大脑导水管的可能性，该部位是胶样囊肿的高危区域。
作者报告了一例57岁男性患者，有6个月进行性头痛、短期记忆丧失、视力模糊及一次复视发作的病史。磁共振成像（MRI）显示一个直径22毫米的胶样囊肿，附着于第三脑室后部的顶部。第三脑室后部受阻，但孟氏孔均通畅。通过经孟氏孔的右额旁矢状、半球间、经脑室入路完整切除了整个囊肿。它并不位于中间帆内。患者术后未出现任何神经功能缺损。
该病例支持了第三脑室后部区域的胶样囊肿有导致梗阻性脑积水风险的理论证据。这份关于罕见部位大囊肿的报告描述了一种独特病变，并提供了首次发表的MRI描述。
