Yamaguchi Satoshi, Hirohata Taizo, Sumida Masayuki, Arita Kazunori, Kurisu Kaoru
Department of Neurosurgery, Shobara Red Cross Hospital, Hiroshima, Japan.
Neurol Med Chir (Tokyo). 2002 Mar;42(3):137-9. doi: 10.2176/nmc.42.137.
A 72-year-old woman presented with an intradiploic arachnoid cyst in the occipital intradiploic space which was found incidentally by magnetic resonance (MR) imaging. Computed tomography revealed a widened diploic space and thinning of the inner and outer tables of the occipital bone. The cyst appeared as isointense to the cerebrospinal fluid on both T1- and T2-weighted images. The differential diagnosis of intradiploic epidermoid cyst could be excluded because the lesion was low intensity on diffusion-weighted MR images. Arachnoid cyst is a benign lesion, so exploratory surgery should be avoided unless the cyst is symptomatic. Diffusion-weighted MR imaging is an effective modality to distinguish diploic epidermoid cysts from arachnoid cysts.
一名72岁女性因枕部板障内蛛网膜囊肿就诊，该囊肿通过磁共振成像偶然发现。计算机断层扫描显示板障间隙增宽，枕骨内、外板变薄。该囊肿在T1加权和T2加权图像上均表现为与脑脊液等信号。由于该病变在磁共振扩散加权图像上呈低信号，可排除板障内表皮样囊肿的鉴别诊断。蛛网膜囊肿是一种良性病变，因此除非囊肿有症状，否则应避免进行探查性手术。磁共振扩散加权成像是区分板障内表皮样囊肿和蛛网膜囊肿的有效方法。
