Neurenteric Cyst with Alteration of Signal Intensity on Follow-up MR Images
Miyuki Shakudo
,a,
Yuichi Inouea,
Kenji Ohataa and
Saori Tanakaa
a From the Department of Radiology (M.S.), Osaka City General Hospital, and the Departments of Radiology (M.S., Y.I., S.T.) and Neurosurgery (K.O.), Osaka City University Medical School, Osaka, Japan.
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FIG 1. Initial MR imaging.
A, Axial T1-weighted MR image reveals a high-intensity cystic mass, 3.5 cm in diameter, in front of the medulla oblongata.
B, Axial T2-weighted MR image shows that the mass has higher intensity than brain and lower intensity than CSF.
C, Sagittal T1-weighted MR image reveals that the mass compresses the medulla.
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FIG 2. Images obtained 2 years 9 months after initial MR examination.
A, Axial T1-weighted MR image shows that the cystic mass has isointensity and has increased in size.
B, T2-weighted MR image shows that the cyst has higher intensity than CSF.
C, Diffusion-weighted image shows that the mass has low intensity. The finding may enable differentiation from epidermoid cyst, which can show similar intensities on T1- and T2-weighted MR images but shows iso- or hyperintensity compared with brain on diffusion-weighted images.
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FIG 3. Histopathologic sections (hematoxylin and eosin, original magnification x400). The cyst wall is composed of a single layer of ciliated (arrows) columnar epithelium and was diagnosed as a neurenteric cyst
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