The Utility of Diffusion-weighted Imaging with Navigator-echo Technique for the Diagnosis of Spinal Epidermoid Cysts
Keiichi Kikuchi
,a,
Hitoshi Mikia and
Akira Nakagawaa
a From the Departments of Radiology (K.K., H.M.) and Neurological Surgery (A.N.), Ehime University School of Medicine, Ehime, Japan.
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FIG 1. MR images of spinal epidermoid cyst (arrow).
A, Slightly inhomogeneous high signal intensity mass on T2-weighted image (2888/110/3) at the T5–T9 level.
B, Low signal intensity mass on T1-weighted image (350/12/3).
C, No contrast enhancement is seen on T1-weighted image obtained after the IV administration of contrast material.
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FIG 2. A–C, Diffusion-weighted images with a gradient b-values of 0 (A), 250 (B), and 1000 s/mm2 (C). On the diffusion-weighted image of higher b-value, tumor intensity remains high (arrow). The vertical artifact likely appeared because of pulsatile motion of superior sagittal sinus.
G–E, Calculated apparent diffusion coefficient maps. Apparent diffusion coefficient values of epidermoid cyst is 1.3 x 10-3 mm2/s (G) (arrow) and 1.6 x 10-3 mm2/s (arrowhead). The solid nature of the spinal epidermoid cyst is represented.
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