Sharifi Guive, Rahmanzadeh Reza, Lotfinia Mahmoud, Rahmanzade Ramin
Department of Neurosurgery, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Neuroscience Division, Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran.
World Neurosurg. 2018 Jan;109:31-35. doi: 10.1016/j.wneu.2016.12.067. Epub 2016 Dec 23.
Colloid cyst is a gelatin-containing cyst in the brain almost always found in the third ventricle. The specific shape and location of these cysts, a round well-delineated mass in the rostral part of the third ventricle adjacent to the foramen of Monro, on imaging are the main findings for diagnosis. Several masses of the third ventricle masquerading colloid cysts on images have been reported. Based on different surgical approaches, preoperative misdiagnosis of colloid cyst may have great impact on prognosis.
We report 2 cases that presented with severe headache and hydrocephalus, and their preoperative images were highly indicative of colloid cyst.
Histopathologic investigations after tumor resection showed pilocytic astrocytoma of fornix in both cases.
Fifteen cases of colloid cyst misdiagnosis with other masses have been reported thus far; among them, 2 cases were pilocytic astrocytoma. In this study we report 2 other cases. Furthermore, we discuss additional clues helping to differentiate pilocytic astrocytoma from colloid cyst on images.
胶样囊肿是一种几乎总是位于脑第三脑室的含明胶的囊肿。这些囊肿的特定形状和位置，即在影像学上表现为第三脑室前部靠近室间孔的圆形边界清晰的肿块，是诊断的主要依据。有报道称，在影像学上有几种第三脑室肿块会伪装成胶样囊肿。基于不同的手术入路，术前对胶样囊肿的误诊可能对预后产生重大影响。
我们报告2例表现为严重头痛和脑积水的病例，其术前影像学表现高度提示胶样囊肿。
肿瘤切除后的组织病理学检查显示，两例均为穹窿部毛细胞型星形细胞瘤。
迄今为止，已有15例胶样囊肿被误诊为其他肿块的病例报道；其中2例为毛细胞型星形细胞瘤。在本研究中，我们又报告了另外2例。此外，我们还讨论了有助于在影像学上鉴别毛细胞型星形细胞瘤和胶样囊肿的其他线索。
