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Intradiploic Arachnoid Cyst Identified by Diffusion-Weighted Magnetic Resonance Imaging. Case Report
Journal article   Open access   Peer reviewed

Intradiploic Arachnoid Cyst Identified by Diffusion-Weighted Magnetic Resonance Imaging. Case Report

Satoshi YAMAGUCHI, Taizo HIROHATA, Masayuki SUMIDA, Kazunori ARITA and Kaoru KURISU
Neurologia medico-chirurgica, Vol.42(3), pp.137-139
2002
DOI: 10.2176/nmc.42.137
PMID: 11936057
url
https://doi.org/10.2176/nmc.42.137View
Published (Version of record) Open Access

Abstract

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.
intradiploic arachnoid cyst diffusion-weighted magnetic resonance imaging

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