Department of Radiology, Ankara Numune Education and Research Hospital, Ankara, Turkey.
Diagn Interv Radiol. 2010 Mar;16(1):7-9. doi: 10.4261/1305-3825.DIR.2650-09.2. Epub 2010 Jan 27.
To reveal the magnetic resonance imaging (MRI) properties of incidental petrous apex cephalocele (PAC) and coexisting empty sella-arachnoid cyst.
We reviewed our archive from June 2005 to July 2008. Four patients were diagnosed with PAC (four females; age range, 41-60 years; mean, 48.5). All patients underwent MRI examination of the cranium. We evaluated the lesions for extension into the neighboring structures, content, signal intensity, enhancement, and relation to Meckel's cave, petrous apex and for the presence of empty sella.
The presenting symptoms included headache for three patients and diplopia for one patient. All patients had bilateral PAC, more prominent on one side. All lesions were centered posterolateral to the Meckel's cave. They were isointense to cerebrospinal fluid signal intensity and continuous with Meckel's cave on T1W, T2W and FLAIR sequences. In two patients, there was no diffusion restriction on diffusion-weighted MR images and the ADC map. Three patients had empty sella. One patient had arachnoid cyst.
Coexistence with empty sella-arachnoid cyst raises the possibility of cerebrospinal fluid inbalance in the etiology.
揭示偶然发现的岩骨尖颅腔膨出（PAC）和并存的空蝶鞍-蛛网膜囊肿的磁共振成像（MRI）特征。
我们回顾了 2005 年 6 月至 2008 年 7 月的档案。4 名患者被诊断为 PAC（4 名女性；年龄 41-60 岁；平均 48.5 岁）。所有患者均接受了颅部 MRI 检查。我们评估了病变向邻近结构的延伸、内容物、信号强度、增强以及与 Meckel 氏腔、岩骨尖的关系，以及空蝶鞍的存在。
主要症状包括 3 例头痛和 1 例复视。所有患者均有双侧 PAC，一侧更为明显。所有病变均位于 Meckel 氏腔的后外侧。在 T1W、T2W 和 FLAIR 序列上，它们与脑脊液信号强度等信号，与 Meckel 氏腔连续。在 2 例患者中，弥散加权 MR 图像和 ADC 图上没有弥散受限。3 例有空蝶鞍。1 例有蛛网膜囊肿。
与空蝶鞍-蛛网膜囊肿并存提示在病因上存在脑脊液失衡的可能性。
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