From the Department of Neuroradiology (J.C.B., J.L., K.N.K.)
From the Department of Neuroradiology (J.C.B., J.L., K.N.K.).
AJNR Am J Neuroradiol. 2019 Dec;40(12):2090-2093. doi: 10.3174/ajnr.A6311. Epub 2019 Nov 28.
Temporal lobe encephaloceles are increasingly identified and treated as epileptogenic foci. However, there is relatively scant research on the prevalence of asymptomatic encephaloceles. This study set out to describe the frequency of incidental temporal lobe encephaloceles and middle cranial fossa pits.
A retrospective review was completed of high-resolution (≤0.5-mm section thickness) axial T2WI for internal auditory canal protocol imaging. The presence and laterality of middle cranial fossa pits (small bony defects containing CSF) and encephaloceles (brain parenchyma protrusion through osseous defects with or without bony remodeling) were recorded. Electronic medical records of patients with encephaloceles were searched for a history of seizure.
A total of 203 patients were included in the final cohort; 106 (52.2%) women. Forty-five (22.2%) patients had middle cranial fossa pits: 14 (31.1%) unilateral on the right, 17 (37.8%) unilateral on the left, and 14 (31.1%) bilateral. Ten (5.0%) patients had ≥1 encephalocele, none of whom had a documented history of seizure in the electronic medical record. No significant difference was noted in the frequency of pits or encephaloceles based on sex (= .332 and = .383, respectively) or age (= .497 and = .914, respectively).
Incidental middle cranial fossa pits are common findings, and their prevalence is not related to age or sex. Temporal lobe encephaloceles, though rarer, also exist occasionally among asymptomatic patients. Such findings have diagnostic implications for encephaloceles identified during imaging work-up for epilepsy.
随着时间的推移，越来越多的颞叶脑膨出被认为是致痫灶。然而，关于无症状性脑膨出的研究相对较少。本研究旨在描述偶然发现的颞叶脑膨出和中颅窝裂的频率。
回顾性分析了高分辨率（≤0.5 毫米层厚）内听道轴位 T2WI 成像的内部听觉通道协议。记录了中颅窝裂（含有脑脊液的小骨缺损）和脑膨出（脑实质通过骨缺损突出，伴或不伴骨重塑）的存在和侧别。搜索有脑膨出病史的患者的电子病历。
共有 203 名患者纳入最终队列；106 名（52.2%）女性。45 名（22.2%）患者有中颅窝裂：14 名（31.1%）右侧单侧，17 名（37.8%）左侧单侧，14 名（31.1%）双侧。10 名（5.0%）患者有≥1 个脑膨出，其中在电子病历中均无癫痫发作史。基于性别（分别为=0.332 和=0.383）或年龄（分别为=0.497 和=0.914），裂或脑膨出的频率无显著差异。
偶然发现的中颅窝裂是常见的发现，其发生率与年龄或性别无关。颞叶脑膨出虽然较少见，但在无症状患者中也偶尔存在。这些发现对癫痫影像学检查中发现的脑膨出具有诊断意义。
