Intradiploic arachnoid cyst identified by diffusion-weighted magnetic resonance imaging--case report.
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.
Yamaguchi
Satoshi
S
Department of Neurosurgery, Shobara Red Cross Hospital, Hiroshima, Japan.
Hirohata
Taizo
T
Sumida
Masayuki
M
Arita
Kazunori
K
Kurisu
Kaoru
K
D000368:Aged; D016080:Arachnoid Cysts / Q000175:diagnosis* / Q000601:surgery; D002555:Cerebrospinal Fluid; D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000175:diagnosis; D005260:Female; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D009777:Occipital Bone / Q000473:pathology