Article

Intradiploic arachnoid cyst identified by diffusion-weighted magnetic resonance imaging--case report.

Department of Neurosurgery, Shobara Red Cross Hospital, Hiroshima, Japan.
Neurologia medico-chirurgica (impact factor: 0.61). 04/2002; 42(3):137-9. pp.137-9
Source: PubMed

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.

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Keywords

72-year-old woman
 
Arachnoid cyst
 
arachnoid cysts
 
benign lesion
 
cerebrospinal fluid
 
Computed tomography
 
cyst
 
diffusion-weighted MR images
 
Diffusion-weighted MR imaging
 
distinguish diploic epidermoid cysts
 
intradiploic arachnoid cyst
 
intradiploic epidermoid cyst
 
isointense
 
lesion
 
occipital bone
 
occipital intradiploic space
 
outer tables
 
thinning